The rolls at walmart and similar places are generally bigger than the ones at dollar stores but both work just as well. You will find it in the housewares section of walmart with the shelf liner usually.
I do a lot of crafts with it for the kids and they like just sticking tuff on and off of it. Ideal for making suncatchers for the kids. It can also be used to cover game pieces instead of laminating and ideal for spur of the moment things.