Picked up an ASUS RX 580 4GB OC for $45 USD... missing 2 fan blades and i/o shield, but works flawlessly, cool and quiet! : r/Amd
Amazon.com: RX 580 Graphics Card, 256 Bit 2048SP Real 8GB GDDR5 PC Gaming Miner Video Card for AMD, 3 x DP, HDMI, 16 PCI Express 3.0 with Dual Fan for Desktop Computer Gaming GPU : Electronics
Asus Dual Radeon RX 580 OC 4GB review | 54 facts and highlights