What was the cost for an order of 500? I think a couple of people have previously tried to get together a group buy here on CPF for these headlamps but have always fallen short of the number needed. Pity because it works like a good headlamp.
It may be worth waiting for the Zebralight H30 that is due out in Dec. That is a 1xCR123 Cree Headlamp with 3 levels. Their H50 1xAA HL was fantastic so I would expect the same for the H30.
Another option is buying the 1W version HP-902X from here and seeing if you can mod it to use a seoul/cree/rebel.