Thought about it but decided not to. With a large sample size you can tack on shipping costs yourself using the average and arrive at a rough guesstimate of fair value. There would be listings with free shipping, those with $50 shipping but overall I think the average of it all will stem towards the assumption of reasonable shipping rates. Also not all of these are from US eBay, perhaps they might be from UK eBay or CA eBay. The shipping rates would depend entirely on where you are located and the item's location.
The lowest price I could find for 2012 oz panda from an online us dealer is $44 ungraded and $90 PCGS MS70. How is it possible that on ebay the prices are so much lower? Presumably people have bought from dealers and then there is shipping cost?