There are a lot of DuoScan models - from $700 to $8500(!). I had a 6x7 done on one and wasn't particularly impressed with the results (though it was better than nothing). A compromise might to be to get a Nikon Coolscan III ($750) for 35mm and send out your medium format work. Any inexpensive flatbed would be ok for prints.(posted 8814 days ago)My local lab, however, only charges $.50 a scan for 35mm from their Nikon - and they have to worry about setup, depreciation, and repair. They charge $5 for 6x7 scans on their Minolta (since they aren't automated).
(see www.scanneroutlet.com)