Dell Refurbished

Edit 2019-08-29: M.2 Support page

You can find 3rd gen i5 for aroung $200 -$400 on ebay. 2nd gen go for $150 and are Optiplex 790
9010
Type DDR3
Speed 1600 MHz
Connectors:
Desktop, Mini-Tower,
Optiplex 9010 2 GB, 4 GB, 6 GB, 8 GB, 16 GB, and 32 GB
Bus Type PCIe gen2, gen3 (x16), USB 2.0, and USB 3.0
Bus Speed PCI Express:
• x1-slot bidirectional speed – 500 MB/s
• x16-slot bidirectional speed – 16 GB/s
SATA: 1.5 Gbps, 3.0 Gbps, and 6 Gbps
PCI Express x1:
Mini-Tower up to three full-height cards
PCI-Express x16:
Mini-Tower up to two full-height cards