Back in the day, not everything had to come with a big price tag from the Mountain Equipment Co-op.
This DYI camp stove was featured in Road Rider back in 1988. Designed by Frank Osborne to be flat, cheap to build, easy to pack on a motorcycle, and burn either charcoal or small sticks. You can start with various materials, but he made his from a couple of three-pound coffee cans.
I've uploaded the 3-page article on it here.