If you want to save money try using a non-stick oven liner. You can cut it to fit your area. (Don't forget to cut a hole for the needle.) I just tape the outside edges down with blue painters tape, and it works just as good as my Supreme Slider did.
http://www.amazon.com/Handy-Gourmet-JB6154-Stick-Liner/dp/B005M2D5BW/ref=sr_1_3?ie=UTF8&qid=1444306677&sr=8-3&keywords=oven+liner