When it comes to these kinds of dealings:
-Cash is King.
-No third party cheques, or money transfers into oblivion.
-If Western Union is mentioned, run the other way holding your wallet.
-face-to-face delivery/pick up whenever possible.
-Outside of Ebay, (ie; CL) Cash trades hands upon delivery, this works whether you are the buyer or seller. No pigs in a poke.
We all owe it to the Scammers, to respond, send numerous and frequent Emails to them. Ask them lots of questions. Play dumb. Give the Email to others so they can also send inquiries. Bascially, tie the scammers up in knots so it becomes impossible for them to sort out their true marks.
There aren't enough investigators and fraud units to handle these boobs.
As was mentioned above, if the deal seems to good to be true, it probably is. But if you feel the need to pursue it, go for face-to-face transfer of funds at time of delivery.