Well, WORRY NO MORE!
I'm as cheap as they come and am always looking for the best deal, (
I'll start with the basics first
1. always sell thigs in groups, (ex if you have 5 short swords scattered in different characters inventory, put them all in the same characters inventory) do this because after a merchant has bought an item from you, the price for it will go down if you come back later or switch to another characters screen.
2. always have a good knowledge of which gems are the most valuable so you don't throw out a rouge stone for a garnet gem (obviously - goes without saying but i thought i'd mention it anyway)
3. Diferent merchants give differnet prices. The best overall deal is in the underdark from the svinerble, or something, gnomes - they give about 20% more per item - as opposed to the duergar or drow who give you 20% less than standard (standard being what you get from Ribald and others)
4. keep a good reputation (
5. always get the pesant rooms at inns, the others are double to four times as much for what they should be in respective terms. (or you could be real smart and sleep in the sewers like me, sure it stinks and you get a couple rat bites, so what? you save 1 gold don't you?)
6. Also, some might say that drinking at taverns is a waste of money, but you've got to do something with all that money you've saved don't you.... hic....ooooo, why are the roads soooo wooobley.......
tahts it for my little obsession, for NOW!!!!
HAHAHAHAHA..hic...oooooo
also, did you know that you can recharge wands and roads by selling them and then buying them back.