I'm clearing out a bunch of old game items that have been cluttering up my house, and my wife is listing them on eBay.
One of the items probably qualifies as an extremely rare item that would interest the truly devoted Munchkin collectors: a set of Munchkin 2 Unnatural Axe which has all of its treasure cards misprinted in the same manner as the Clerical Errata set.
This one is probably rarer than even the Clerical Errata sets.
The eBay listing.