There are devices that will let you transfer gas from a large cannister (cheaper per 100g) to a small one. They are, of course, strongly warned against by gas cannister manufacturers, fire brigades, A&E departments, lawyers, etc. I know someone who uses them – he's still alive, but he's good at things like that. They do have to be used with great care and there is potential for the recipient gas cannister to explode.
Or you can use an alcohol burner (which would invalidate this whole thread, but also smells nicer).