I've got a pair of scissors I bought at a fabric store, the blades are about 8" long and they're teflon coated. Cost about $35 or so so they were stupid expensive but they cut like a dream and we've been using them for about 5 years now. I'll see if the name of the mfr is still on them, it may have worn off by now.
Don't buy scissors that have a serrated blade, I made that mistake, you can't slide them through paper easily, it bunches up. The cutters that look like a pizza wheel work great too for slicing up decals, way better than a knife or traditional scissors. They're also worth every penny.