This is an industry that I am about to enter into, and trust me, you will need to be buying in serious volume to get a price that will even come close to letting you compete on a site like ebay.
The real opportunities lay in developing your own selling platform I think, but then you have the issues of generating traffic, not an easy market to crack either way.
Has taken me the best part of a year and a whole lot of networking to get into a position where I think we can take some market share of a few, but even with all that time spent and money invested so far, no guarantees in that market.
Good luck with it.