http://shop.hobbylobby.com/products/...-frame-132639/ or
http://www.amazon.com/Q-Snap-SF17-La...3655806&sr=8-8

I'm sure there are other stores that carry this type of lap frame, but this is the type I really like. I have it in two different sizes. I also have a large, oval frame that used to have a stand, which I never used, but used the frame in my lap. I much prefer the PVC type. They are easier to move around on your quilt and you don't have to worry about splinters.