Dropshipping to ebay is one of the easiest ways to lose money. Unless you have a niche item, ebay buyers will be unlikely to pay a profitable price. Someone once did the math, figuring in the cost of time, and found it worked out to less than minimum wage. By the time you factor in time, customer service, returns, bad bidders, etc... you need a 10:1 markup ratio to make a decent profit on ebay.
Also be aware that some drop shippers have a bad shipping reputation, which WILL effect your feedback rating if you don't investigate them completely before you sign up with them.
The trick to making money on Ebay is to bring people to your website. Get items with fewer features on them, list them cheaply (near cost) on ebay and feature your website with more advanced items on your site. People may be willing to spend more there, and you'll be pulling in repeat visitors if things are setup right.
For this reason I would not use drop shipping for ebay. I would spend afew hundred dollars and buy some cheap goods in my category from a "light bulk wholesaler", ie: someone that sells in less than $200 lots. Then lead to a site that offers drop shipped items from there.
As for finding actual drop shippers, you can never beat talking directly with importers and manufacturers. You usually get a 2:1 markup on drop shippers, but you won't be able to beat ebay and walmart prices... so choose your items carefully. Be aware of drop ship "clearing houses" or places that offer multiple "warehouses." They're usually middlemen, and if I find the manufacturer directly... I can undercut you. And trust me, if I can do it... so can many others.
Don't go for "hot" items, or "popular" items. The more popular something is, the more people will be selling it and the less you'll be able to charge. Go for items that are wierd, unusual, or very specific. The old ebay commercials of someone looking for specific ugly green lamps are entirely accurate, the stranger it is the better it sells.
Go to:
www.wholesalecentral.com
I know one of the account execs there. They have a merchandiser magazine specifically for regional flea markets. If you talk with those suppliers you can find someone willing to drop ship or ship in small lots.
Make sure you have a state tax and resell license before talking with these suppliers. If someone says you don't need it, they're probably just selling items near retail cost... which means you won't get much margin.
Not enough to make enough money. Resell certs mean you've spent a little time to get legal, ie: you're serious enough to be considered. Companies have to make a profit, how would someone make a profit by undercutting their other retailers thru you? There's always something fishy there.
This is something I've had quite a bit of experience with... bad, good, ugly. While I rarely do it anymore, I used to do a lot of telephone coaching for this. If you're interesting in something like that, let me know.