List of every item at the market, with prices.
All items are just the Buy price, unless it says Sell:
Protection Stones
CoalOre (11x11x11) 1 for $1,500
LapisOre (22x22x22) 1 for $10,000
DiamondOre (41x41x41) $55,000
Plants and Food
Egg~ disabled
CookedBeef~ 1 for $35
CookedPork~ 1 for $35
Apple~ 1 for $8
GoldenApple~ 1 for $400
Cookie~ 1 for $8
Cake~ 1 For $150
Bread~ 1 for $ 20
Cactus~ 32 for $250
Sugarcane~ Buy: 32 for $40 Sell: 32 for $5
Rose~ 8 for $40
Flower~ 8 for $40
BrownMushroom~ 2 for $20
RedMushroom~ 2 for $20
Vine~ 32 for $50
BoneMeal~ 8 for $100
BirchSapling~ 8 for $25
RedwoodSapling~ 8 for $25
Sapling~ 8 for $25
Seeds~ 8 for $10
PumpkinSeeds~ 2 for $20
MelonSeeds~ 2 for $100
Redstone
Redstone~ Buy: 32 for $250 Sell: 32 for $125
Button~ 1 for $20
Lever~ 1 for $ 20
WoodenPressurePlate~ 1 for $100
StonePressurePlate~ 1 for $100
Piston~ Sell: 32 for $1600
Tools and Armor
StoneAxe~ 1 for $25
StonePick~ 1 for $25
StoneShovel~ 1 for $25
Stone Sword~ 1 for $25
ChainHelment~ 1 for $100
ChainPants~ 1 for $175
ChainShirt~ 1 for $200
Chain Boots~ 1 for $75
GoldAxe~ 1 for $ 1000
GoldPick~ 1 for $1000
GoldShovel~ 1 for $350
GoldSword~1 for $650
GoldHelm~ 1 for $1600
GoldPants~ 1 for $2300
GoldShirt~ 1 for $ 2800
GoldBoots~ 1 for $1300
IronAxe~ 1 for $650
IronPickaxe~ 1 for $650
IronShovel~ 1 for $250
IronSword~ 1 for $450
IronHelm~ 1 for $1100
IronPants~ 1 for $1500
IronShirt~ 1 for $1800
IronBoots~ 1 for $900
DiamondAxe~ 1 for $2500
DiamondPick~ 1 for $2500
DiamondShovel~ 1 for $2000
DiamondHelm~ 1 for $4000
DiamondPants~ 1 for $6000
DiamondShirt~ 1 for $6750
DiamondBoots~ 1 for $3750
Bucket~ 1 for $250
Shear~ 1 for $200
FishingRod~ 1 for $25
Bow~ 1 for $150
Arrow~ 16 for $35
Utilities
Bed~ 1 for $45
Bookshelf~ 1 for $75
WoodDoor~ 1 for $20
IronDoor~ 1 for $100
TrapDoor~ 1 for $25
Fence~ 8 for $40
NetherBrickFence~ 12 for $100
Torch~ 8 for $10
Sign~ 1 for $15
Chest~ 1 for $40
Furnace~ 1 for $30
Dispenser~ 1 for $250
PoweredRail~ 6 for $2100
DetectorRail~ 6 for $600
MinecartRail~ 16 for $ 1200
Minecart~ 1 for $45
Materials
Coal~ Buy: 32 for $150 Sell: 32 for $75
IronIngot~ Buy: 1 for $200 Sell: 1 for $50
IronBlock~ Buy: 1 for $900 Sell: 1 for $450
GoldIngot~ Buy: 1 for $350 Sell: 1 for $75
GoldBlock~ Buy: 1 for $3500 Sell: 1 for $675
Diamond~ 1 for $750
DiamondBlock ~ 1 for $6750
Clay~ 32 for $100
Lapis~ Buy: 16 for $500 Sell 16 for $100
Blocks
All WoodLogs~ Buy: 64 for $250 Sell: 64 for $50
Guest market Plank~ Buy: 64 for $150 Sell: 64 for $30
Member Market Planks~ Buy: 64 for $250 Sell: 64 for $50
BrickBlock~ Buy: 64 for $800 Sell: 64 for $200
Gravel~ Buy: 64 for $75 Sell: 64 for $20
Dirt~ Buy: 64 for $60 Sell: 64 for $15
Stone~ Buy: 64 for $150 Sell: 64 for $40
Cobblestone~ Buy: 64 for $75 Sell: 64 for $ 15
MossyCobblestone~ Buy: 16 for $250 Sell: 16 for $50
StoneBrick~ Buy: 64 for $150 Sell: 64 for $40
CrackedStoneBrick~ Buy: 64 for $3000 Sell: 64 for $ 160
MossyStoneBrick~ Buy: 64 for $3000 Sell: 64 for $160
Sand~ Buy: 64 for $60 Sell: 64 for $15
Sandstone~ Buy: 64 for $240 Sell: 64 for $60
BrickSlab~ 8 for $140
StoneBrickSlab~ 8 for $50
CobblestoneSlab~ 8 for $30
WoodSlab~ 8 for $20
SandstoneSlab~ 8 for $20
StoneBrickSlab~ 8 for $60
StoneSlab~ 8 for $80
WoodStair~ 8 for $40
CobblestoneStair~ 8 for $60
BrickStair~ 8 for $280
StoneBrickStair~ 8 for $60
NetherBrickStair~ 10 for $100
Netherrack~ Buy: 64 for $75 Sell: 64 for $15
Endstone~ Buy: 32 for $2000 Sell: 32 for $50
Glowstone~ Buy: 8 for $200 Sell: 8 for $65
SouldSand~ Buy: 32 for $350 Sell: 32 for $20
Grass~ 32 for $300
Mycelium~ 32 for $500
NetherBrick~ 32 for $250
All wool~ 32 for $250
Hopefully this will help you out! Could it possibly get stickied? I will constantly update this and I will also make one in alphabetical order, when I get the time.