Hi...I bought mine second hand from a dealer about two months ago and paid £500...($770) ....I know I am in the Uk...but two things I thought...
1. Aren't the prices sort of set by Janome so that there shouldn't be that much variation between prices for new machines...although with a trade in it does make a difference.
2. In the last few months the 7700 and the now the 12000 have come out which will probably mean the price will fall for new 6600 machines and also there should be some really good second hand bargains out there at dealers from people trading up.