Average Prices
Well someone needed to do this.
Suggest prices for things that I haven't named here, or point out any changes.
Market Price: You buy it at /warp market for $x, and sell it at /warp market for $y.
Trader Price is the normal price players will sell this item for.

Colors Codes!
"Red Item Name" means that that item cannot be sold at /warp market
"Yellow Item Name" means that that item cannot be bought at /warp market
"Green Item Name" means that that item is not at /warp market, and must be sold on the free trade market.

Gems, Ores, and Other Precious Items

Item	Market Buy Price	Market Sell Price	Trade Price
Diamond	$750 (per piece)	null	$50 (per piece)
Gold	$350 (per ingot)	$75 (per ingot)	$60-75 (per ingot)
Iron	$200 (per ingot)	$25 (per ingot)	$20-30 (per ingot)
Lapis	$500 (per 16)	$100 (per 16)	$?
Obsidian	null	null	$25 (per piece), $1.6k (per stack)
Iron Ore	null	$50 (per piece)	$50 (per piece)
Sandstone	$250 (per stack)	$60 (per stack)	$?

Building Blocks (Useful and Decoration)

Smooth Sandstone	$350 (per stack)	$65 (per stack)	$?
Carved Sandstone	$350 (per stack)	$65 (per stack)	$?
Brick Blocks	$800 (per stack)	$200 (per stack)	$?
Stone Steps	$80 (per 8 )	null	$?
Stone Brick Steps	$50 (per 8 )	null	$?
Wooden Steps	$20 (per 8 )	null	$?
Brick Steps	$140 (per 8 )	null	$?
Iron Bars	$180 (per 16)	$90 (per 16)	$?
Wooden Fence	$40 (per 8 )	null	$?
Glass	$90 (per 16)	$15 (per 16)	$35 (per stack), $8.75 (per 16)
Glass Panes	$40 (per 16)	$10 (per 16)	$?
Sand	$60 (per stack)	$15 (per stack)	$25?
Gravel	$75 (per stack)	$25 (per stack)	$?
Grass	$300	null	$?
Mycelium	$500	null	$?
Wool (White or Colored)	$250 (per 32), $500 (per stack)	null	$50-100? (per stack)
Oak Wood Logs	$250 (per stack)	$50 (per stack)	$80 (per stack)
Birch Wood Logs	$250 (per stack)	$50 (per stack)	$80 (per stack)
Spruce Wood Logs	$250 (per stack)	$50 (per stack)	$80 (per stack)
Jungle Wood Logs	$250 (per stack)	$50 (per stack)	$80 (per stack)
Oak Wood Planks	$250 (per stack)	$50 (per stack)	$20-25 (per stack)
Birch Wood Planks	$250 (per stack)	$50 (per stack)	$20-25 (per stack)
Spruce Wood Planks	$250 (per stack)	$50 (per stack)	$20-25 (per stack)
Jungle Wood Planks	$250 (per stack)	$50 (per stack)	$20-25 (per stack)

Miscellaneous

Dragon Egg	null	null	$15k
Moose	null	null	$50k