http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=3189039958
Auction for Erdös number 5 up to $152.50! (My father-the-mathematician emailed: “This is weird, because there are a couple of thousand people with Erdos number 2 (mine is 3), so an Erdos number 5 must be as common as dirt.”)