Oh......you can "sell" all you want. "Shipping" is another matter altogether...........
And......One way or the other, new customers will need a motor. Whether they scavenge it off of the used Autotrickler, or buy a new one. If the supply of motors dries up, so does the ability of customers to put their new IP Trickler into service, to some significant degree.
If it were my decision to make (which obviously, it's not), I'd be laying in inventory of as many motors as I could. Particularly at $17.00 (Sell price) a piece. I wouldn't want to have to deal with pissed off customers that had taken delivery of their new ($375.00) IP Trickler, but couldn't use it because they couldn't get a new ($17.00) motor for it. And yes, there are going to be sales of used Autotricklers where the sellers include the (used Autotrickler) motor. Meaning, the motors start becoming "Hen's Teeth", particularly for the new IP purchases.