My experience has been on eBay that many products are either at, just below or just above wholesale.
One way to succeed at eBay is to become a legitimate retailer and order direct from the manufacturer, then as part of your business sell stuff on eBay.
That is just one way. Another that Fuddj suggests is to sell liquidated stock.
Another very good way is to find niches. Meaning, something that not a lot of people are selling or a way to sell something better.
And another is to dropship. Which has the main pitfall of finding items at a low enough price.
Right now, using internet only, I haven't seen a better place to get pricing to sell than right here. You probably wont find better pricing on the internet.
The only better source would be to get yourself on mailing lists and getting yourself invited to trade shows and making contacts from there. You will have to shake a lot of hands and have some cash.
Another option is to take a trip to Asia and make contacts with businesses there. The problem with that is of course the language barrier so you will have to find a good escort(Not the bad kind.) to translate for you. Though you may find some contacts that speak English.