I went to bed bath and beyond and bought the betty crocker oven liner. It was about 10 bucks and you can cut to the size you want. It is a silicone material like the slider and works great. I think it was 18 x 24 inches or something like that. I just put a small hole for the needle and it works great. It does have to be taped down also. but it works fine and is inexpensive.