Best forum to find macbook for sale?

Make sure you sign up for ebay bucks, that will get you 2% back on any purchases you make.

Craigslist-You can pretty much tell by price where the scammers are. If the price is too low, its a scam of one kind or another.

Also meet in a public place and I would ask for the serial #. There are a few sites that will give you the true specs and if any warranty remains.