HP Pavilion Ryzen 3700x 256GB 8GB $549

[cromo]

HP Pavilion TP01 0066 Desktop PC - Office Depot

Seems like a good deal.

• AMD Promontory B550A Chipset
• Ryzen 7 3700x CPU
• One PCIe x16 socket
• One PCIe x1 socket
• One M.2 socket 1, key A
• One M.2 socket 3, key M for SSD (PCIe x4)
  

Uses B550A chipset, not sure whether it supports IOMMU groups properly.

Motherboard spec:
HP Desktop PCs - motherboard specifications, Erica | HP® Customer Support