Have you tried the 3rd tab at the top of this page? > 'Product Research' Click on that..
Also when you get on that page, try looking at:
'Auction Inspector' it's good for product research and stats.
Another good one, but a bit more in depth is:
If you don't want to spend any money on research software, just use the 'completed listings' feature on ebay..It can be a bit time consuming, but all of the info on any product being bought and sold on ebay can be found by doing a completed listings check...Located on the 'sitemap' page under the heading 'more ways to find products' ..