Almost anyone not worth dealing with will be known about by some (if not all) of the members here. Bad guys names spread fast. Posting an inquiry on someone is a great start. Also, some common sense will help a lot.

Anyone from Africa is usually a scam. A price greatly lower than market usually means the ad is bogus. No pics when dealing with high dollar morphs is a red flag.

Just check out anyone before you decide to send the money and get a copy of their TOS.