walmart sells the chintzy little hand-cranked models for 20 bucks (which is like, 2 pence in funny money, so no excuses for not having one!)
I've bought one of those things and they don't feckin work. They may remove small scratches but anything bigger than a bee's dick (the scratches that actually make a difference) and you could crank until the polar ice caps melt and you still wouldn't even be close to buffing that sucker out.