My players are missing some serious business trading rules like the one in "death on Reik"....were basically u get some tables to generate a buying and selling price for wholesale goods.

Anyone have already come up whit something similar, suited for 3ed???

I second that, especially since I am going to play DotR. On the other hand, why not use it, as is? Is it too incompatible that breaks down the 3rd edition canon?