Caporegime
There are two parts of this story, first one is that the GeForce GTX 1080 and GeForce GTX 1070 are out of stock almost everywhere but as soon as new stock fills in, they are sold out in minutes regardless of the pricing which leads several retailers to inflate prices on such products due to immense demand in the consumer market.
The GTX 1080 and GTX 1070 are high-performance cards and feature great performance increases over their old GM204 based counterparts. The GeForce GTX 1080 on average is about 25% faster than a GeForce GTX Titan X with OC models showcasing even better performance numbers.
One reason to believe as to why the GeForce GTX 1080 is selling great everywhere due to which it is out of stock on all retail stores would be shortage developed due to low availability of retail units. That doesn’t seem to be the case as sources close to Fudzilla (mostly NVIDIA AIB partners) have confirmed that the GeForce GTX 1080 was the biggest volume (high-end) graphics card launch done by NVIDIA. The GeForce GTX 1080 had even more units available in the retail market than the GeForce GTX 980 and GeForce GTX 980 Ti, all of which sold out in a single day.
http://wccftech.com/nvidia-geforce-gtx-1080-success/