Yep,the seller has listed yet another one, if anybody is interested:
ebay Item #
384759169431 ...
As someone previously noted, there seem to be a number of these out there, possibly as many as a few thousand. But still, this doubled die could well be rarer than the 1955/55 cent. I've read that a single working die could be good for 50,000 or so strikes before it wears out.