Doug has a review of the pocket chainsaws at Saws and Axes

And Old Milwaukee the makers of the Sawzall have their own handle at Sawzall handle

I have the old style handle and a pocket chainsaw and they both work. Not as easy as the power models but a whole lot lighter and easier to carry.

With the Sawzall or saber saw blades you can make a handle. Take an appropriately sized stick. Split about 1 inch into one end. Insert blade and wrap tightly with cordage. No it won't work as well as a real handle. But it'll do in a pinch.