Here is the new and updated list to the shop prices. Remember that these prices are only for shop 1, to calculate the prices for the other shops, add 10% per shop level to these values. Here is the formula for example.
"What is the difference in iron ore from shop 1 to shop 5?"
Shop 5 - Shop 1 = 4 = 40% = 1.40
Iron ore $10 * 1.4 = $14.00
Baked Potato $0.10
Bread $0.10
BrownMushroom $2.00
CactusGreen $0.10
Cake $20.00
Carrot $0.05
Charcoal $1.00
Clownfish $300.00
Coal $2.50
CocoaBeans $0.15
CookedChicken $0.10
CookedFish $4.00
CookedPorkchop $0.10
CookedSalmon $97.50
Diamond $25.00
Diamond Ore $100.00
Emerald $5.00
Emerald Ore $75.00
Glass $1.00
Gold Ingot $2.00
Gold Ore $30.00
Ink Sac $0.20
Iron Ingot $1.00
Iron Ore $10.00
Lapis $3.50
Leather $0.10
Melon $1.00
NetherQuartz $3.00
Netherwart $0.15
Poison Potato $2.00
Potato $0.05
Pufferfish $150.00
Pumpkin $0.50
Pumpkin Pie $3.00
RedApple $6.00
RedMushroom $2.00
Redstone $2.00
Seed $0.05
Slime Ball $0.10
Snow $3.00
Steak $0.10
SugarCane $0.20
WhiteWool $0.10
Note, that to my knowledge, this is the finalized list of the shops.