I got my Laminator of Amazon for 25€ (30-ish $) and it came with a bunch of sheets.
Commonly made beginner mistake:
Don't cut the foil after laminating too close to the picture. It's best to leave about ~5mm of foil standing on every side of the picture. It will wear and tear and 5mm is a good amount which will keep the picture itself safe for a couple of months (depending on use)
Also don't forget to leave a space where to punch a hole through. Pretty much self explanatory, but I've done that before too xD
Also: The first time you use it, it's gonna smell badly. And I mean worse than a dog fart. Far worse. Do it near an open window. If you don't use it for some time, the next time will smell too, because the dust inside it will burn from the heat.