evilBay
Hey Bob -
I think it may be worth considering. It would give members a ' heads up ' for those items of interest, parts or cars that are listed on eBay.
The only disadvantages I can see, is inflated prices from bidding wars, if more than one person is interested in an item. (This is great for the seller, but not good for the buyers.) Also, people sometimes buy items on eBay at a reasonable price, with the intention of selling them at inflated prices, to realize a healthy profit. (It's the American/Canadian way !)
You also have a pretty fair set up for Parts / Cars in your existing format!
Just mho.