Buying M-55!

I'm looking for a used (in good condition) m-55 to buy.
Maybe you guys could help me out on a price to be looking at, i'm not really sure what they go for. I think a new one is around $4,800? Maybe I could get sponsored by musser and get a free one?... haha. Thanks for any help!
Hopefully someone's got one out there to sell!
nathaniel