If you're baking on a sheet pan ... using silicone baking mats (such as SilPat or other brands) are actually significantly cheaper per use than parchment paper. We had a discussion about this 3-4 years ago - I can't find the thread - but I compared the prices.
When making tortillas, hamburger patties, etc, - parchment paper is no more non-stick than waxed-paper.
"It ain't what you don't know that gets you in trouble. It's what you know for sure that just ain't so." - Mark Twain