Personally, I think there should be a set price and those that saw this thread and/or buck up 1st gets the reward of purchasing the product. Setting up an auction and letting everyone know about it is almost like how some ppl post here about Contique items that are listed on Ebay which is frowned upon here b/c all it does is raise the bid price. The general consensus (and I agree) is that Ebay items (and IMO items here) are to benefit the ppl that spend the time and look hard for the items/deals and those that find it first deserve 1st dibs.
On a side note I do not want to take away any profits from Butters as that is not my intention at all. I hope he does make a profit from his hard work. I'd much rather him set a price that he deems is fair and also makes some $ at the same time. Just my .02