How to cut aluminum plate?

I need to make some motor mount shims out of 1/8", 1/4", and 3/8" aluminum plate. I don't have a band saw or any other fancy tools. I made one cut with a sawzall, but it took forever. I imagine a jig saw would to. I've heard a skillsaw works, but I'm leery of using one because the parts I'm cutting are so small. Do you guys have any ideas??? Thanks.

I don't even bother cutting stuff like that anymore. I just shoot a drawing over to the local laser cutting shop and then drive over and pick up the parts. Just about everything I do anymore on the car starts with a laser cut part. No mess no fuss and they fit perfect.