Why buy drives from OWC? OWC adds-on a 90-day *replacement* warranty, meaning that a problem drive will be replaced with a NEW drive within 90 days. This is a BIG DEAL if you are making a RAID or depending on the drives; sending a drive in for warranty essentially means another one has to be purchased to fill the hole—not so with this OWC 90-day guarantee.
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While MPG generally recommends purchasing the OWC Thunderbay with all 4 drives (so the entire unit is- pre-tested and warranteed together), it is possible to BYO (build your own) with multiple hard drives, consider an OWC Thunderbay enclosure, with an about $380 Thunderbay Thunderbolt 2 enclosure and an about $399 Thunderbay Thunderbolt 3 enclosure.