[dmalvarado]

You can filter to Sold Listings to see what the average price is. The problem is that in many auctions for similar items are actually not so similar.

I search for camera gear a lot. When it comes to camera bodies, there's a lot of variation. With lens or without, with battery grip or without, what's the shutter count? What's the cosmetic condition? etc. etc.

But generally I just end up with a range by manually looking for the highs and lows, and then try to nab one at a price I think would be a "good deal"