I swore off eBay for a fair while, tried Oztion but it just doesn't have the range of goods, or the bargains that ebay continues to offer. Trading Post is the same, and the website is slower than a month of rainy Sundays!
I spend a bit of time upgrading family computers (5 kids, 9 grand kids, and assorted riff raff!) and Oztion just doesn't have the right stuff. An 80GB hard disk for $32, 2 GB of laptop memory for $64, only eBay provides those products at those prices. And don't go spending any money on astro gear on either site, it's 99.99% pure rubbish, don't bother even looking!
Cheers
Chris