and don't pay with Western Union!
As someone who has bought and sold several Macs on eBay, beware anyone that asks you to pay by Western Union MO. You have no way of geting your money back, and eBay's guarantees are next to worthless. Paypal's are not much better, but if you pay by credit card through Paypal, you have a decent level of protection (and they have a somewhat decent way fo tracking someone down.)
1. As people have said b4, if it sounds too good to eb true, it probabaly is.
2. If they will only take a MO or Western Union, run!
3. If someone offers you free shipping and its goign to overnighted from the UK of Saigon, be smart enough to realize this is a sham. Imagine how much it would cost to do such a thing! You cna barely get soemone to ship a computer from the states for free.
4. Check what they've sold recently on their feedback rating. If a guy is selling a dual g5 with a 20" cinema display and the only pics are from apple's website, and all the items they've sold are Dale Earnhart mugs and Xena posters for like $5, then you're resobaly assured that there IS no g5 waiting to some across the Atlantic to you.