hi daryl
they are old but you might still be able to find one in great shape ..
look for a epson 4870 and you will be able to run it with vuescan no problem.
there is no 5x7 holder it only has holders for 120, 4x5 and 35mm, but you can easily
put the film on the glass or on mylar and the lid-light is big enough to scan whole plate ..
(I've been using mine since probably 2004? purchased refurbished / used from epson, and I've scanned 10s of thousands of thing)