You won't because the flashlight isn't actually released yet. This will probably get moved to the marketplace, but opticsHQ, Batterystation, Batteryjunction, Brightguy.com are all good dealers I've used in the past.
**Oops, got your post confused with the UA2 optimus. They probably stock the U2A, perhaps it's out of stock right now. Go ahead and email or call
U2a= updated version of the original U2, now with a Seoul ssc P4, instead of the old Luxeon 5. It's a bit throwier than the original, and has longer runtime/more output.
I can highly recommend the U2A it is an excellent flashlight... the U2 is one of the best designs of all times in my book and the U2A makes this light even better with longer runtimes and a wider range of lighting levels.