Sam Duong moves boxes to stock the store at Central Computers, Thursday, Jan. 25, 2018, in San Francisco, Calif. Cryptocurrency miners are buying out all the high-end graphics processor units they can find, which is driving the prices up and causing supply shortages at stores like Central Computers. A single unit was on display, an EVGA GeForce GTX 1080 Ti SC for $1,059.95.