Keep an eye out on eBay,
I picked up 4 Acard 7720uw's for $60 each a few months ago.
ACard has a total racket on the SCSI<->IDE adapters. There's no way in 2017 that these couldn't be made more cheaply. It's really too bad that there aren't any enterprising hardware hackers out there making competition for these.
I have several machines I'd love to add IDE devices to that are purely SCSI; some Amiga and some Macintosh. But at $220+ I can barely even consider buying one.
