Most retailers don't carry the white blacklights, and at least in my area, none of the big box stores do.
I was able to find some at a local lighting specialty shop. They were expensive (I think around $14 or so), but it's worth it to go pick one up when I need one.
I think one of my games, Kozmik Kroozr has one specd' above the CPO or perhaps behind the star scene, but I just have a standard one installed. From experience, does the white black light make a nice difference/improvement?