I bought a laptop on ebay 2 month ago. That was a sweet deal. When you buy sth. from there, keep remember the following list,
1. Ask seller to ship by USPS (if it's in US)
1.5 Ask seller to ship as a present or gift.
2. Ask seller if he can use COD (UPS)
3. If the seller is close to you, meet him in person
...
I met the seller in person in a small town. I think that's the safest way.
Good luck!