I'm awaiting a used Optimus 11 Explorer now, just located one, should have it next week. Still looking for a white MSR pump, any condition, working still would be nice but I've heard many do not trust one that old. There is still a few very early model MSR stoves I don't have that I need to fill a few holes in my early stove collection. Up to over 65 now of differing brands and styles, I keep locating one now and then, it gets harder to come by them.