The film scanners that I know off which scan 6x7 film are the Nikon Coolscan 9000 ED (RP $5300), the model it replaced, 8000 ED (RP $5600) and the Minolta Dimage Scan Multi Pro.
Flatbed scanners like the Canon CanoScan 9900F ($600 plus) , Epson Perfection 3170, 3200 (about $700) and 4870 ($700+) can also scan MF film.