Where can I find flat sheets of christmas wrapping paper?

I usually look in higher-end stationery stores; shops that sell handcrafted items will often carry it during the holidays; also, any shop that sells handmade paper should have it. Expect it to be more expensive by the sheet, if lovely to work with and look at. Presumably, you know that already, though. :P

I think I’ve seen them at Hallmark Card Shop if you have one of those near you.