I'm just starting hardshoe, and it's obviously impossible to make much sound while doing hardshoe on carpet! So I've decided to make a temporary dance floor - or, in other words, a sturdy piece of wood I can put on the floor of my bedroom to dance on, and then lean against the wall when I don't need it.

What type of wood (or other material) would you guys recommend for this? I need something pretty sturdy, but not so heavy that I couldn't move it back against the wall on my own. I don't mind if it stains easily, either. But a 6' by 4' piece (which is about what I need, as my treble jig travels around the space a lot!) can't cost more than about $30-40, or I won't be able to afford it.