The black ones are out of stock already, but there are still white ones left. Evildragon said in a support chat with me that more will be put up for sale by the end of next week.
Update 1 December 30th, 2016: All gone for now, but Evildragon says he will put more up for sale eventually.
Update 2 September 18, 2017: They are back in stock again. 3 Black and 2 white left.
Update 3 September 19, 2017: Out of stock again.