I am putting my third Inverted 2x2x2 up for sale. The first was my prototype and the second went to flambore in a trade. I had originally wanted to make these for a fixed price with an order list, but I just don't have enough time to make puzzles these days so I will making a few mainly for trades and occasionally perhaps for an auction.
Details on the puzzle can be found here
Here is the Auction link
I made the auction 5 days as I wanted it to end on a weekend.