If you go to the local hardware store you can buy new, empty paint cans in various sizes. They have very strong rims and make good stoves, and seem to last longer than ordinary tin cans.
My very favorite stove is the Little Dandy design by Nimblewill Nomad, www.nimblewillnomad.com, which is cut out of sheet metal and so takes down into a flat compact package for transport. The design can be upscaled or downscaled to suit your size needs.