Now create make niche ebay or amazon affiliate store sites with phpbay wordpress plugin. Here is my short review of phpBay plugin.
phpBay or phpZon is a powerful premium paid wordPress plugin that will allow you to turn your WordPress blog site into a eBay or amazon niche affiliate website.  This is similar to another popular eBay script called BANS, and will help you to set up and manage your online store quickly and easily, with a number of useful features including the ability to list items by keyword, category, zip code or eBay seller, and  to display products in columns or rows. The plugin also creates SEO optimized and masked titles.

With phpBay plugin you will also be able to set minimum and maximum limits for product price and number of bids, and also allow you to optimise WordPress to improve search engine traffic.  phpBay offers two main versions of their  plugin software including a limited free version called phpBay Lite, or an enhanced, fully functional premium version phpBay Pro, which costs $79 and can be installed on unlimited domain names. phpBay comes with full support, comprehensive manuals and video tutorials.

Demo $ Details ebay store plugin