I'd been using the Cybernetics HSTC devices
http://www.cybernetics.com/E_SPEC/HSTC/HSTC_RAID.htm

and had been very pleased with them. However they now only sell them fully
populated with drives, and the markup on their drives is such that a 16tb
unit is now $23k.

Can you give me a link to any devices you're aware of that may be closer to
$15k?

Thanks.