Guys, make sure you hand the cash to the old biker in the corner and not tuck them in the co-ed's thongs. (Keeping a hard moderator's eye on the PG rating of this thread.)
Sure, I'd buy a good, used blade, as long as the condition is good and the price is right, and it doesn't look like it was used in the commission of a crime. I hear Luminol works really well.
What are you pedding? We have a buy/sell/trade section.