My Sapphire 830 bought new years ago cost $1100. I bought it at Joanns but take it to the local Viking repair for serviceing.
It is a great machine and so far no repairs.
They did give me a box of extras that included a table, open toe stippling foot,walking foot,free motion guide foot, guide grip. It is called Quilters Kit IV.
I did buy a 1/4 inch foot but now dont even use it. The machine has a button to push for 1/4 in and then I just adjust the needle for scant.