I haven't seen it in this thread, but I may have missed it - you can search eBay for completed auctions. I use this all the time to get an idea of what to expect for a sale price. When I use Buy It Now, I usually aim the price to be just under the average prior sales if I want fast action. I usually get it.
I agree that free shipping seems to draw customers too.
I agree that free shipping seems to draw customers too.