I've been thinking of this for a very long time and have just now acted upon it due to Curt's misfortune with the oil can bank in the previous post. And I'm sure many of you are way ahead of me on this.
I just started keeping a list of sellers that are, shall I say, not on the level or downright dishonest. There is probably some legal munbo-jumbo about posting a list of sellers on this site, but a PRIVATE list may keep someone from getting ripped off. I know even with the best sellers there could be a problem (buyers can be jerks too) but they will try to resolve any problem. Ones that don't respond, keep money without shipping the item, and blatantly post misleading items will go on my list for future buying references.