45drives is offering an 8 3.5" Bay SAS chassis for $600. It supports an ITX motherboard and FlexATX PSU.
https://store.45homelab.com/presale/hl8
I have a line on another Lenovo SR630v1. Dual 500W platinum PSUs, 4xu.2, 8xSAS, 2x10GbE + 4xGbE and 80(!) 2GHz threads for $400, and I can use the...