I can build you a 500mW 405nm in a custom built host for 155.00 or if you are stuck on just a 5mW 405nm we can probably find a nice 5mW module and put it in a custom built host. Just the host itself will cost you about 55.00 bucks.
Do a search with my name to see some of the stuff I have built.
My Super Miniar™ drivers are adjustable down
to 20mA. If someone knows where to get a
case neutral 405nm, I'm not sure I have the
diode on hand right now.