I've had this website saved on my computer for a while:
http://quiltersreview.com/index.php/...ting-a-breeze/
It's a review of the Handi-quilter that you have (I think), and she mentions a price of $579. However, the review is from 2002, so I'm not sure if the price would be higher now.
NOTE: By the way, this is not sold by the same company that makes the Sweet Sixteen. It's a totally different entity.