SAS3 HBA and SAS3 HDD Case Suggestions

I am looking for an external case that can fit 4 SAS3 HDD’s that will attach to an hba in a truenas scale system. It doesn’t require hot swap bays. I guess this would be similar to a Das chassis.

I am also looking for an hba that will work in a pcie 3.0 x4 lane slot and run at 12Gbps.