FWIW, I ordered my transfer case skid a couple of years ago and followed up with an email many months later because I was beginning to wonder what happened with the order. The part showed up a few days later without any other form of communication (I'll take it!).
Savvy makes production orders as they seem fit, and my complete guess is that some replenishment orders aren't made until they see sufficient demand (backorder purchases). Again, I have no idea if that's true or if it's largely luck that they supply the part you need when you need it. But, my engine skid and shifter cable were also ordered on backorder and showed up right on schedule (a few months later).
If you can wait, the parts are absolutely worth it. But, I don't blame anyone who chooses not to play by those rules.