Er.... Yeah I use the search function several times a day on this forum, and yes I used X drives on my last build. However. I'm not sure how searching old threads is going to tell me where I can find one in stock today?
Survival laser has some round buck drivers adjustable to 400mA min. And those could easily have leds soldered to the contact points to make it more like a rectangular one. This is assuming space isn't too much of an issue.
Lazerer should be getting back to the forum soon, so hopefully some drivers will start becoming more available- hes making them now still, but I could only assume prosuction would increase when he returns- hes been dealing with personal matters.I would say waiting for his drivers would be your best bet. Dont want to skimp on drivers, for sure.
Also, drop Jeff (flaminpyro) a pm, and ask about driver stock. He usually has pretty good communication with lazerer.