2 of those really never made it very far which show's how little interest most companies have selling a product with so little profit. 21 Inc made a RPI topper for a insane price they knew would not sell but only a few. I always wondered how many they even made as I think it was a very limited batch.
I still would buy a Bitfury light bulb today if it sold. But they said it would come to market... and never did ended up being a show piece they seem to have did to try to impress Richard Branson ( https://twitter.com/richardbranson/status/606827985388335105 ) when they had a few companies go to his island a while back. On these did we ever see more then the 3 they showed off?