Mike probably makes small batches at a time to reduce the amount of stock (and therefore cash) which may not ever be sold. Makes sense really as conversions are not as numerous as they used to be since everyone is releasing e-versions of their stuff now. I would definitely shoot Mike an email to let him know (if he doesn't know already).
Yeah and I do not blame him a bit for doing small batches. These units rock for making TMaxx brushless conversions. I am gonna do a FLM / UE Maxx brushless truck. I was contemplating sticking a SB OS I have on it but a brushless truck is just awesome and quick to get going. So I need one of these to do the project.