The ASRock X570 Phantom motherboard is $99 on Amazon right now. If you don’t need IPMI or ECC RAM, this is the board to get. It has fantastic IOMMU groups, so it’s very easy to do PCI-e hardware passthrough to VMs. I currently use it and have a GPU passed through to a VM for transcoding and an HBA passed through to a different VM for storage. This kind of thing can be a pain on the B-series motherboards.