Early this morning, August 14th 2014 there was a very limited restock of the ZX Flux Multicolor Prism. At the time of this post, there are only a few of the smaller sizes left in stock. No word yet if there will be more on the way or if this was just a very limited restock online.
There have also been reports of the multi-color prisms restocking at the adidas Originals stores such as Chicago and New York. If there is an Originals store near you, it is worth checking out in case they get a restock.
UPDATE 11-25-15: The original ZX Flux Prism has restocked over at Eastbay in sizes 7-13 for $89.99.