I've been roasting my own lately, in a popcorn popper. It's cheap, quick, fun, actually decent if I don't completely mess it up, and occasionally even surprisingly good (as in, "I'd pay $20 for a bag of this"). Because of the size of the popcorn popper, I only roast ~100g at a time, so lots of experimentation with roast times, etc. I definitely go on the lighter side.