Another possible substitute for Supreme Slider
I'm lucky to have a quilting table with a set in area for the machine, but where the plastic insert sits around the machine there's a little bump that can cause the fabric to drag.
I went to Joann's today to pick up some clear vinyl to place in the needle area of my machine for FMQ. The cutting table area was packed so I decided not to wait for the vinyl. On my way out I found a 2 pack of 11"x15" "Flexible Cutting Mats" for $2.50 where they have all the bargain stuff. They're like two very thin placemats. Used a coupon so it cost $1.25. I cut out a piece for the feed dogs, taped them together from the back, and then taped the front and back edges to the table.
I've done very little FMQ, but I think this really helped.