<font color="blue">Sears, Home Depot, Lowes and stores like thats should all have sawzalls. Crafstman makes a nice one.
Do you have access to compressed air? I got a Mac air saw today, it's about 7" long without the blade, lightweight and goes through floors like nothing! Its way less bulky than a sawzall, and much easier to use. I like it a lot. Unlike a Sawzall, it was designed for auto body use.