I love my 6600P. A good used one should be in the neighborhood of $600. At least that is what my dealer said I should ask for mine if I try to sell it myself. It is NOT for sale. Lots of 6600 owners want to move up to the 7700 so are selling or trading. Takes seconds to engage the dual feed foot which stays attached on the back. I lift the pressor foot, move the dual feet portion under the regular pressor foot, it snaps into place and I sew!
There is a yahoo group for Janome 6500/6600. You become a member to learn if you are interested in purchasing. Love my machine.
Teresa in McKinney, TX