Over at Computex, German tech site ComputerBase got to hear that almost all Radeon RX 570 and RX 580 cards are sold immediately. This leads to elevated prices as miners have no issue with paying 300EUR for even the simplest Radeon RX 580 models, which is a lot higher than the recommended retail price of 259EUR.
The very strong mining demand caught AMD by surprise and the company is currently unable to provide enough Polaris 20 GPUs. Increasing the supply of GPUs isn't done in a matter of days, it takes several weeks to months to significantly boost supply and if AMD orders too much it could be faced with the exact opposite problem if the mining demand dries up due to a Bitcoin and altcoin crash.
Due to the shortage of AMD cards, miners are now turning their attention to GeForce GTX 1060 and GeForce GTX 1070 cards from NVIDIA. Additionally, power supply makers are seeing increased demand for units that can deliver more than 1000W.