I bought my Brother Nouvelle 1500s, previously loved (aka used) for $400. It is a straight-stitch only machine, thread cutter, auto threader, needle up/down, 1500 smp, knee lift, extension table. It is not computerized. I love love love this machine.
Put the word out to all your local quilt shops, guilds, friends, and yes, even the dealers, what you want and your price range. It's entirely possible your dealer may take a used machine in trade and (after servicing, hopefully) in turn, sell it to you at a very good price.