Like Joe said, I think it's a good price if it's a 15-91, which is the machine with the potted motor and good wiring. The potted motor is the one that has direct drive (no belt). Make sure you get all the accessories they have. Most of these machines had buttonholers and a box of different feet. Mine had a zig-zag attachment, which had never been used. (I know that because it was my mom's).
bkay