Have you thought about BANS? Build A Niche Store. Basically you buy this BANS script for about $37. Then you buy a domain and hosting, if you use 1&1 they cost about $5 a month with 2 free domains. Basically the BANS script allows you to select a category, books,movies,cars,womens clothes,ect. Then in the middle page of your site, it shows an ebay listing of those items, as well as the bid and time left. If someone buys the product off ebay through your site, you get commission. I also think you get a really good chunk of change if they are new and sign up for ebay, then buys.

With SEO practices, and advertising on the right sights, you may be able to get an okay amount of sales. I would say after you have made the first few sales, venture into Adwords of something and push your site hard. Some people make a few grand a month off their BANS site.