Buy a superknife, can find one for a few bucks now with pretty much every hardware store having a version.
I beat on mine at the tarp factory just about every day when I was there. Blades were about $0.10 each when bought bulk(100 blades for $10+taxes), easier to just flip the blade over at noon and put a new one in daily for that price.
Used it again this fall when we put in carpet down here, fresh blade and done quickly.
Coffee before Conciousness
Why do people worry more if you argue with your voices than if you just talk with them? What about if you lose those arguements?
Slowly going crazy at work... they found a way to make the voices work too.