Hi Alice.
Here is a link to the Viking site. The link is to the Sapphire machines. The second is a brochure for the 835 with a chart on the last page comparing the 835, 855 and 875. There are individual brochures for the other two machines. Just select on-line brochures on the left side of the window.
http://www.husqvarnaviking.com/us/17049.htm
http://www.husqvarnaviking.com/us/me...ochure_ENG.pdf
I was in the North Attleboro Joann's on Sunday. There's a sewing dealer in the store, carrying mostly Vikings. They were marking down machines including the Sapphires. I don't remember the amounts though but they might quote over the phone.