Sometimes.. (an open admition here) I don't actually have a use in mind for what I order.
I have three "bankers boxes" full of X10 stuff in the basement. Another smaller box with two "Enerlogic 1400s". A very early controller (1987) which used a modified Basic for the "Schedule" (macros using IF-THEN-ELSE). Who knows how much of the old stuff still works.. The third Bankers box box is all new stuff, still in X10's sky blue boxes.
Sigh... my wife has had three "X10 interventions" for me over the past decade.
But I have some unusual stuff: A Leviton branded Telephone Responder that can send all 256 codes.
A "NuTone" branded transceiver that spans all 16 House Codes like the CM15A and built in a 10 inch square NuTone doorbell housing .
A couple "Regulator" lamp modules made by Bear Cat (CB, Scanner, company). This was not an X10 product and had 100 HCs and 100 UCs. The first 16 HC / UC were completely compatible with X10.
I doubt any of it works anymore. I am not sure what the life span of the reactive power supply caps are. Don't know if they break down or not. Some day before our next move I will have to check everything out....Probably be another intervention the next day.