I used to do a lot of ebay selling. I signed up at a site called Worldwide Brands. They have a ton of resources, educational vids, and a wholesaler/dropshipper database that they add to all the time. I don't know what it costs now, but back in the day it was $500 to sign up... quite expensive, but I got a lot of good wholesalers from it. I recommend checking out the wholesaler section of the blackhat forums if you don't want to drop that kind of money

Never google search wholesalers. You'll only find a bunch of retail sites that claim to be wholesale...
If you want to get smart, find specific products you'd like to sell and contact the manufacturers directly to try and set up a wholesale relationship. You may need to contact quite a few companies before one would like the idea, but it's definitely worth it. Try and target smaller companies. Don't go for the big brand name products... You'll never get in. New products from new companies are the best for this kind of thing.