Cheapest way to get distortion

So i'm learning how to play electric guitar, but i'm getting bored. I need distortion in my practace songs to keep myself interested. What's the cheapest way to get distortion into my setup? My amp is a POS that doesn't have much more then bass/treble controls.

Cheap pedal is probably the best option, I've seen decent brands run about 35-60 in canuck funds. I'll have a name or two later if you need more info.