Well, of course I was speaking of a new price, and with a little searching I found I was way low in my estimating. CCM has a 7' for around $2300 and Northern Tool has one for around $3300. I can buy a lot of new rotary cutters for that price. I could probably buy a KK rotary cutter and a KK RFM for the price of a new sicklebar.
But as you say, there are always bargains to be had if you look long enough and are willing to invest a little sweat-equity. I think I'd have a smile on my face everytime I looked at my sicklebar cutter if I had found the bargain you have.