I've used propane instead of acetylene for years. You can't weld with it, although it gets hot enough, the gases produced don't seem to shield the molten metal. It's fine for brazing, cutting and general heating and you don't have to keep expensive acetylene bottles.
The only difference between acet & prop torches is the nozzle, which is cheap and easy to change.
Beware, when buying a new torch that the inlet fittings match those available in your area. I bought one off e=bay once (only because it was cheap!) and couldn't even get a name for the threads, never mind finding a left hand-connector.