Unfortunately, There are not many good drop ship companies out there.
The eBay market place doesn't allow for it, as the market would saturate itself.
Lets say DOBA got great deals on computers/parts which were competitive on eBay.
Everyone and their mother would be selling them. You still wouldn't make any money as there would be so many sellers in ratio to buyers.
Why would DOBA do this. They would have to invest in so much stock to get the better deal. People would join up realize that there were so many sellers and get discouraged and this happens anyway so it doesn't make sense to do it.
Plus if you have the best prices you might as well sell on eBay yourself.