Some of those ideas are: A classic cast iron bowl. You can make one yourself or buy it — they are usually quite cheap; Small gas stove for tourists. There are many variations; some of them are more expensive and some not, but keep in mind that many are pretty small; A covered DIY construction made of rolled-up sheet metal; A repurposed washer drum (this one may not cost you anything if you have an old washer just rusting away!) Generally, repurposed metal things like a cast iron pan can work great with some minimal modifications.