I recently bought mine from craigslist for $125 with the cabinet, original chair, and 4 of the expensive attachments plus the regular set of attachments. I know that I got a great deal, but when I looked on my craigslist today, there were at least 2 more of the things for sale under $200, and one for $400 with the cabinet, so try looking there.
I love this machine for FMQ! I bought the foot for it and it works really well. I also have a featherweight, and the 301 feels just like it.
You wont regret getting this machine, it is a workhorse, mine is a 1951 mocha short bed 301.