For regular contracts, I'd select a rate I could guarantee over the long run (rises and falls of market prices). If there are items which you feel are underpriced, please let me know which items. All the items should capture the full range of reasonable buy/sell prices.
Hehe... this is funny, because I just saw someone on SMP9 wanting 200r for 15 grass blocks. Why don't I break that?
The main items I need are building blocks and supplies like (diamonds, gold, redstone, iron, coal). If anyone is hard working and can produce items like that, let me know please! It would be awesome to work with you.