You probably want to take a look at last month's beginner tips:
Straight Razor Place - Beginner's Tips: November 2013

It's best to stay away from ebay, but if you really want to gamble make sure you spend some time in the ebay forum section and pick some tips. Unless you end up buying from one of the few ebay sellers who are actually good at sharpening, you may have to have the razor honed afterwards. How to tell who is good and who is just making the claim so that they can get more money for their stuff - I'd say there's almost no way for you to know.