According to many listings on Newegg and elsewhere the RX 580 has been out of stock for weeks. The Coin Mining business first shifted from CPU mining to GPU mining and from that to ASIC mining however there have been ASIC resistant coins like Eth that have had their value go up 3 times in recents month. Due to ASIC resistant coins being unable to be mined with ASIC rigs, people are now buying up GPUs and running them most likely in multi-GPU set-ups to get the most performance out. Dual RX 480s were rated to run at a hashrate at 1400 according to this Monero benchmark page which out-beats a GTX 7990 or RX 290X.
There was another time when such a shortage back when GPU mining was again king for coin mining back in February 2014 and that was the RX 290X (you can see that article here on Digital-Trends. The craze over it was due to people wanted to mine Litecoin and Bitcoin before Bitcoin took off and it started to become accepted in lots of internet outlets online. Shortages persisted over time, Prices were really hiked up to buy one just like this case.
Currently on Ebay one could get a new ASUS RX 580 for as much as $580, over twice the cost of a regular RX 580 and as little as $330 if one rather risk their hard earned cash to bid. Buyers would be wise to wait out this frenzy and buy one later when the shortages start to die off a bit however if you're part of the crypto-currency craze then I would keep an eye on the NowInStock.Net site. It's a very good site to keep handy if something's high in demand however right now everything is out of stock for the RX 580:
