To make a larger slider for my machine - I found this at a thrift store.
It's a 16"x16" piece of teflon coated "plastic" that has a repositional adhesive on the back. It's labeled as a Microwave Oven liner. It's huge, easy to cut to allow for opening the bobbin case etc, and in my opinion works as good or better than my Supreme slider.
Cost at thrift store - $5.99
Oh, and add the happy dance!!!! (_/_)(_\_)(_/_)(_\_) :)