Update...the 24" Tannus Armour and 22" tubes shipped quickly and I was able to install on the rear wheel late last week.  All is well after a few rides, even with a full sized passenger on the back.  I don't notice a difference in ride quality, unless maybe slightly more cushion.  The rear tire is inflated to about 40PSI.  I'll eventually do the front tire, as well, but I had just filled that full-sized tube with slime so may I'll leave it as-is until I have an issue and then install the armour and smaller tube.  Here's what I purchased:

https://tannusamerica.com/products/armour-tube-bundle?variant=31991227285615  (24" with no tubes)

https://www.danscomp.com/s-m-22-inner-tube-schrader-2.1-2.4-05-tube-22/p-5uqvs2wqbcaxqage?v=1225413

Total cost delivered is about $100 vs. $165 from Rad. 

Installation wasn't too bad, just make sure the wheel is well supported and don't damage the disk rotor. 

Cheers!
Sam

Just ordered 24" Tannus inserts directly from the Tannus website and was able to find 22 x 2.1" tubes online as well.  Combined total is $100 with shipping rather than $143 through Rad Power.  Should all arrive in a couple days. 

Hi all.  First flat yesterday at mile 70 or so.  Tubes are backordered as usual.  Looking at the Tannus Armour bundle.  Has anyone sourced this from somewhere other than directly from Rad?  Any alternatives?  Pricing seems high, but cannot find anything else on my own with an hour of searching this morning.  Thanks!