A couple of mind-boggling 105 million items available on eBay worldwide and approximately 6 million new items are added each year!
You have to be an associate to be able to sell on amazon. Some hobby sites are raking in insane amounts of money through it. http://privera.net/__media__/js/netsoltrademark.php?d=Geriatia.es%2F%3FURL%3Dhttps%3A%2F%2FSustainabilipedia.org%2Findex.php%2FWholesale_Dropship_-_Avoiding_Common_Wholesale_Dropship_Problems