Specifically on eBay? There are wholesale lots available in many categories. Search on words like lots/ many/ pieces etc.
Keep a close eye on shipping costs.
A $10 lot with $100 shipping for 10 items means you have to sell for at least $22 plus shipping to cover your costs and make any sort of profit. (For that matter a $100 lot of 10 items with $10 shipping needs the same markup)
You are better off to buy locally. Look in the Yellow Pages of your phone book (the paper one) for a product you know something about
SELL WHAT YOU KNOW; KNOW WHAT YOU SELL
Look for wholesalers, manufacturers . liquidators, jobbers and importers. Go there, inspect the product, buy. Describe, picture and list.
Are you wanting dropshippers? Stock up on KY Jelly.