Inexpensive way to start composting?

[Steve Magruder]

I've been trying to think of the cheapest possible way to start composting. I thought of asking for a composter on Freecycle, then realizing I couldn't fit a fully constructed composter in my car or even my mom's SUV. So, I need to use materials to construct one or buy a kit of some sort. Any ideas?

I'm asking because my partner isn't sold on the idea of spending much money to start this, with all the other things we need.