I'm looking for some budget mining motherboards with 1-2 m.2 slots. I found the Biostar TB250-BTC for $69.99. Can anyone make any other recommendations?

A lot of m.2 slots are strictly for SSD/SATA. From the website, "Acorn must go in a M.2 M Key PCIe 2280 slot or a suitable M.2 M Key adapter card in a traditional PCIe slot. M.2 B Key SSD or M.2 B+M Key SATA slots are not compatible with Acorn."

z270-a both m.2 can be set for mining via pcie and they are x4, the second m.2 you have to change it from sata to pcie in the bios. I am mining on both m.2's for months I have this same board.

most of the asus boards support bifurcation so you can use a 4 way m.2 hypercard in the slot instead of board mounted m.2 which won't fit the acorn module if you are mounting gpus on the board

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