Good question. I would like to know as well. Other than the obligatory KD and DX P60 drop in shells, I would like to find a local source for designing custom drop ins. I have been making mine out of coins (soldered together and dremelled smooth for heatsink), and various reflectors/optics that I have lying around, along with drivers from various sources (SS, CPF user download, etc).
I would be far easier to have premade kits to assemble the components rather than monkey around with this stuff. But then again, that's part of the hobby :thumbsup: