Just a thought......Starline makes their brass on a schedule of some sort, and I suspect it is driven to some degree by both general demand and by pending back-orders. This most recent shortage started about the same time that COVID took hold, and got a dose of steroids when the election got sideways in November. In the midst of that mess (about June IIRC) I ordered 500 pieces of 9mm Luger brass, and expected to wait months to receive it. To my surprise, the brass arrived about 6 weeks later.
Just scan this thread's content--I count a number of people considering a refreshing of their leverguns from 30/30 WCF to 38/55. I respectfully suggest that you get in the back-order queue for the 38/55 brass of your choice from Starline. It will likely arrive sooner than expected, and when it does you will have a ready market for whatever brass you have that is surplus to your own needs. If we have learned nothing else from the serial shortages that have beset this hobby field for 25+ years, it is that cartridge brass is--at minimum--a semi-precious metal. Though my own rifle dotes upon the shorter 2.080" flavor, I would purchase the 2.125" variant because regardless of chamber form, that longer brass can be trimmed to fit if necessary, making it saleable to all.