"Out for a long time" pretty much describes the whole field these days. Hasselblad took over the Imacon line (the Flextite series), which is pretty much the only desktop dedicated medium format scanner with any ongoing development. At $13-20K+, though, it's only "in a reasonable price range" for a very small segment of the market -- it's reasonable if it pays for itself; not so much if you are paying for the privilege.
Konica has gone out of the business altogether, as has Polaroid. Kodak will gladly sell you something that you can (and must) build a business around. Epson and Canon are down to clamshell flatbeds (which may be perfectly adequate, if not quite as handy to use as a slot-loading film scanner). All of these had very good dedicated film scanners in the old days, but the preponderance of digital cameras (including medium format) in the industry has made it tough to commit to film scanning.
The few people who still need but don't yet have a 4K or better scanner for anything other than, say, an attic full of 35mm vacation slides or a closetful of 35mm negs are a vanishing breed. There just aren't that many people lining up to pay for something to scan their old Brownie 620 negs at high resolution -- and that's the crowd you'd need to keep a low-cost medium format film scanner afloat.