Stitch regulators are made for straight stitch machines mounted on a frame. The machines are reasonably priced at around $600. They only have a 9 inch throat space.
The stitch regulator costs $500.
Then you need a frame. You can get small ones that only hold a crib size or you can get one that can be set up small or large. I opted for large.
By the time I added the delivery and install it ran me $2300.