John, I have a Dell 3630 that I bought new, at "a good price, for $600." I think this here below is an amazing deal. The 3630 supports one NVMe drive and three hard drives or SSDs in a very strong industrial chassis. It's far beyond consumer quality. So I recommend it, if one NVMe and three SSDs fits your bill.
https://pcserverandparts.com/build-your-own-custom-dell-precision-3630-workstation/