Thanks to David the Math Master for some of this.

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This is the shop guide. There is not much deviation in price in this game (the only exceptions I can think of are the items at the juice bar, including the Kerokerocola) as in other games, but this will help you out. As a bonus, I've added the costs of the inns/energy recharges. Unless otherwise posted, all prices are in standard coins.

Mushroom Kingdom
Where Item Price
Item Shop Mushroom 4
Item Shop Honey Syrup 10
Item Shop Able Juice 4
Item Shop Pick Me Up 5
Item Shop Shirt 7
Item Shop Pants 7
Item Shop Jump Shoes 30
Item Shop Antidote Pin 28
Inn Overnight Stay 3

 

Tadpole Pond
Where Item Price
Frog Coin Emporium Sleepy Bomb 1 Frog Coin
Emporium Bracer 2 Frog Coins
Emporium Energizer 2 Frog Coins
Emporium Crystalline 5 Frog Coins
Emporium Power Blast 5 Frog Coins
Juice Bar FroggieDrink (No Card) 16
Juice Bar FroggieDrink (w/Alto Card) 14
Juice Bar FroggieDrink (w/Tenor Card) 12
Juice Bar FroggieDrink (w/Soprano Card) 8
Juice Bar Elixir (w/Alto Card) 42
Juice Bar Elixir (w/Tenor Card) 36
Juice Bar Elixir (w/Soprano Card) 24
Juice Bar Megalixir (w/Tenor Card) 90
Juice Bar Megalixir (w/Soprano Card) 60
Juice Bar Kerokerocola (w/Soprano Card) 200

 

Rose Town
Where Item Price
Item Shop Mushroom 4
Item Shop Honey Syrup 10
Item Shop Pick Me Up 5
Item Shop Able Juice 4
Accessory Shop Thick Shirt 14
Accessory Shop Thick Pants 14
Accessory Shop Jump Shoes 30
Accessory Shop Antidote Pin 28
Accessory Shop Wake Up Pin 42
Accessory Shop Trueform Pin 60
Accessory Shop Fearless Pin 130
Inn Overnight Stay Free
Inn Finger Shot (talk to Gaz) Free

 

Moleville
Where Item Price
Item Shop Punch Glove 36
Item Shop Finger Shot 50
Item Shop Cymbals 42
Item Shop Mega Shirt 22
Item Shop Mega Cape 22
Item Shop Mega Pants 22
Item Shop Work Pants 22
Item Shop Mid Mushroom 20
Item Shop Maple Syrup 30
Item Shop Carbo Cookie Shiny Stone
Miner's Store Lucky Jewel 100
Miner's Store Mystery Egg (after Marrymore) 200
Miner's Store Metal Plate aka Frying Pan(after Nimbus Land) 300
Mole's house Fireworks 500
Purtend store Shiny Stone Fireworks
Swap shop Fright Bomb 100 points
Swap shop Fire Bomb 100 points
Swap shop Ice Bomb 100 points
Inn Overnight stay 10

 

Marrymore
Where Item Price
Hotel (item shop) Super Hammer 70
Hotel (item shop) Hand Gun 75
Hotel (item shop) Whomp Glove 72
Hotel (item shop) Chomp Shell 60
Hotel (item shop) Happy Shirt 38
Hotel (item shop) Happy Pants 38
Hotel (item shop) Happy Cape 38
Hotel (item shop) Happy Shell 38
Hotel (item shop) B'Tub Ring 145
Hotel (item shop) Mid Mushroom 20
Hotel (item shop) Maple Syrup 30
Hotel Regular Room 10
Hotel Suite 200
Hotel Additional night's stay at the suite 100
Hotel Room Service Pick Me Up 10
Hotel Room Service Kerokerocola 150

 

Seaside Town
Where Item Price
Item Shop (before killing Yaridovich) Bad Mushroom 30
Item Shop (before Yarid) Muku Cookie 69
Item Shop (before Yarid) Fright Bomb 100
Item Shop (before Yarid) Fire Bomb 200
Item Shop (before Yarid) Ice Bomb 250
Frogfucius' Student See Ya 10 Frog Coins
Student EarlierTimes 15 Frog Coins
Student Exp. Booster 22 Frog Coins
Student Coin Trick 36 Frog Coins
Student Scrooge Ring 50 Frog Coins
Weapon Shop (after Yarid) Troopa Shell 90
Weapon Shop Parasol 84
Weapon Shop Hurly Gloves 92
Weapon Shop Double Punch 88
Weapon Shop Ribbit Stick 86
Weapon Shop NokNok Shell 20
Weapon Shop Punch Glove 36
Weapon Shop Finger Shot 50
Weapon Shop Cymbals 42
Weapon Shop Chomp Shell 60
Weapon Shop Super Hammer 70
Weapon Shop Hand Gun 75
Weapon Shop Whomp Glove 72
Weapon Shop Slap Glove 100
Weapon Shop Hammer (lucky) 123
Armor Shop (after Yarid) Sailor Shirt 50
Armor Shop Sailor Pants 50
Armor Shop Sailor Cape 50
Armor Shop NauticaDress 50
Armor Shop Shirt 7
Armor Shop Pants 7
Armor Shop Thick Shirt 14
Armor Shop Thick Pants 14
Armor Shop Mega Shirt 22
Armor Shop Mega Pants 22
Armor Shop Mega Cape 22
Armor Shop Happy Shirt 38
Armor Shop Happy Pants 38
Armor Shop Happy Cape 38
Armor Shop Happy Shell 38
Health Food Store (after Yarid) Mushroom 4
Health Food Store Mid Mushroom 20
Health Food Store Honey Syrup 10
Health Food Store Maple Syrup 30
Health Food Store Pick Me Up 5
Health Food Store Able Juice 4
Health Food Store Freshen Up 50
Accessory Shop (after Yarid) Jump Shoes 30
Accessory Shop Antidote Pin 28
Accessory Shop Wake Up Pin 42
Accessory Shop Fearless Pin 130
Accessory Shop Trueform Pin 60
Accessory Shop Zoom Shoes 100
Mushroom Boy's Shop (after Yarid) Maple Syrup Berry Mushroom
Mushroom Boy's Shop Rock Candy Rippin Mushroom
Mushroom Boy's Shop Flower Tab Flower Mushroom
Beetles R Us (after Yarid) Initiation Fee 100
Beetles R Us Beetle Box 50
Beetles R Us Female Beetle Earn 1 coin
Beetles R Us Male (larger) beetle Earn 50 coins
Beetles R Us Gold Beetle Earn 1 Frog Coin
Inn (before Yarid) Overnight Stay Free
Inn (after Yarid) Overnight Stay 15 or less (depends on # of coins you have)

 

Sea AND Sunken Ship
Where Item Price
Shaman Shop Hurly Gloves 92
Shaman Shop Super Hammer 70
Shaman Shop Hand Gun 75
Shaman Shop Whomp Glove 72
Shaman Shop Sailor Shirt 50
Shaman Shop Sailor Pants 50
Shaman Shop Sailor Cape 50
Shaman Shop NauticaDress 50
Shaman Shop Mid Mushroom 20
Shaman Shop Maple Syrup 30
Shaman Shop Pick Me Up 5
Shaman Shop Able Juice 4
Shaman Shop Freshen Up 50

 

Monstro Town
Where Item Price
Goomba's Shop Spiked Link 94
Goomba's Shop CourageShell 60
Goomba's Shop Mid Mushroom 20
Goomba's Shop Maple Syrup 30
Goomba's Shop Pick Me Up 5
Goomba's Shop Able Juice 4
Goomba's Shop Freshen Up 50
Triplets' Shop Mushroom (turns you into mushroom in battle) 4
Chow Attack Scarf 30 super jumps
Chow Super Suit 100 super jumps
3 Musty Fears' House Overnight Stay Free
3 Musty Fears Ghost Medal Find the 3 flags

 

Nimbus Land
Where Item Price
Item Shop Mid Mushroom 20
Item Shop Maple Syrup 30
Item Shop Pick Me Up 5
Item Shop Able Juice 4
Item Shop Freshen Up 50
Item Shop Mega Glove 102
Item Shop War Fan 100
Item Shop Hand Cannon 105
Item Shop Sticky Glove 98
Item Shop Fuzzy Shirt 70
Item Shop Fuzzy Pants 70
Item Shop Fuzzy Cape 70
Item Shop Fuzzy Dress 70
Inn Overnight stay 30
Inn Dream Cushion 30+overnight stay
(60 total)

 

Barrel Volcano
Where Item Price
Hino Mart (items) Mid Mushroom 20
Hino Mart (items) Maple Syrup 30
Hino Mart (items) Pick Me Up 5
Hino Mart (items) Able Juice 4
Hino Mart (items) Freshen Up 50
Hino Mart (armor) Fire Shirt 90
Hino Mart (armor) Fire Pants 90
Hino Mart (armor) Fire Cape 90
Hino Mart (armor) Fire Shell 90
Hino Mart (armor) Fire Dress 90
Hino Mart (inn) Overnight stay 30

 

Bowser's Keep
Where Item Price
Croco (1st) Mid Mushroom 20
Croco (1st) Maple Syrup 30
Croco (1st) Pick Me Up 5
Croco (1st) Freshen Up 50
Croco (1st) Fire Shirt 90
Croco (1st) Fire Pants 90
Croco (1st) Fire Cape 90
Croco (1st) Fire Shell 90
Croco (1st) Fire Dress 90
Croco (2nd) Mid Mushroom 20
Croco (2nd) Maple Syrup 30
Croco (2nd) Pick Me Up 5
Croco (2nd) Freshen Up 50
Croco (2nd) Hero Shirt 100
Croco (2nd) Prince Pants 100
Croco (2nd) Star Cape 100
Croco (2nd) Heal Shell 100
Croco (2nd) Royal Dress 100
Magikoopa Energy/Magic Recharge Free

 

Factory
Where Item Price
Toad's Shop Rock Candy Free (only 1!)
Toad's Shop Mid Mushroom 20
Toad's Shop Max Mushroom 37
Toad's Shop Maple Syrup 30
Toad's Shop Pick Me Up 5
Toad's Shop Able Juice 4
Toad's Shop Freshen Up 50
Toad's Shop FroggieDrink 30