Our grocery stores do carry the cut sheets of parchment paper. They are folded in 4ths and split very easy on the creases. I use have of a sheet for my small sheet pans.I might have to get on Amazon and see what I can find. I don't want to have to cut sheets. I have a big roll of just brown paper that I used to cover the counter whenever I make noodles and then I have some parchment but they're kind of too big of a sheet so I'm looking to see if I can find any good sized some kind of sheets and then maybe I might make this again. I really did enjoy the one I thought out and heated last night.
You might check the local Restaurant Supply stores too. If you have a Chef'store or Smart & Final or Cash & Carry...or whatever they may be calling themselves in your area (all the same stores)...they might have just the perfect size for you.