Hobby Lobby carries both clear and white Testor's decal sheets, 5 or so to a packet. Also the clear spray to seal the decal after it is made, which smell, looks, and acts like Krylon Crystal Clear. I use the Krylon, it's cheaper. Kryon can also be purchased at Hobby Lobby .
Testors come in half sheets, which work good in that you are not wasting a lot of decal paper if you only have a few decals to do. I have tried several other decal papers for inkjet printers and I think the Testors has the edge over the others.