When I started using them, no one stocked them. I caught them on sale and ordered one ring set of each height (not quick realease). Now, when I use the rings up, I replace them the next time it's convienent. I've been using the Warne's for several years now and have been satisfied.
So become your own "Stocking Dealer". Of course, I don't keep bases, but I generally still prefer the Weaver Base for most applications.
JW