Newegg has the ASRock AB350 Pro4 AM4 AMD motherboard for $57 shipped after $20 mail-in rebate, which is a solid $33 off its retail price of $90. This is a particularly great motherboard for cryptocurrency mining, too, since it has 5 PCIe slots and is theoretically capable of running 5 separate GPUs when you get yourself a good set of risers to go with it.
More details on this motherboard:
- AMD Promontory B350
- Supports AMD Socket AM4 A-Series APUs (Bristol Ridge) and Ryzen Series CPUs (Summit Ridge)
- AMD Ryzen series CPUs support DDR4 3200+(OC) / 2933(OC) / 2667 / 2400 / 2133*
- AMD 7th Gen A-Series APUs support DDR4 2400 / 2133*
- *Please refer to Memory Support List on ASRock’s website for more information.