The items perpetually out of stock appear to be any motor for 180 on up, any casing such as the 180 or 240 (in some cases, no pun intended, the 100, 120 and up), the 29mm adapter system etc... half of the vendors I frequent are out of the forward or end or both closures etc. I have preferred vendors I like to use because they don't ask for list price to be sure... but I cannot fathom why those are so lucky as to not have this stuff. I prefer to do business with a particular vendor for hardware, but they're not the only ones in this situation (I've emailed three and the answer I get is that stuff is on order and that when it arrives, it's usually a partially filled order that comes dribbling in over the course of months). I can bide my time to be sure since I'm not quite ready to use my desired components (the 29mm adapter and the 240 casing). I just wanted to obtain them sooner rather than later as I'm sure they'll "keep". But the fact remains that several vendors appear to be perpetually out of stock on what are obviously popular components. I'm just looking for a reason at this point...