It's always been my experience that Subway Stamp Shop doesn't store many things but gets them from their suppliers like Amos Media (Scott). I imagine they plan to do the same with White Ace from whomever reprints those pages. It can be frustrating to order things and find the company doesn't have them there to send out immediately, but that seems to be the modern business practice.
As for White Ace pages and binders being hard to get, who would have thought? I mean, seriously, the company went out of business last year.
Most things purchased on eBay
ought to be returnable if found not acceptable.
If pages you buy or own are in bad shape, why not reprint them yourself? It's easy enough to buy paper of the weight and shade that matches what you have already, especially for standard 8.5 x 11" pages like White Ace, and photocopy the old, tired pages onto new paper stock. Punch the holes and use a cheap corner rounder, and you have brand new "White Ace pages". Assuming you have pages to copy from, of course. Or use Steiner pages and put them into White Ace binders. Not quite the same, but similar.
As for the binders, why search for years for a matching WA binder when any good 3-ring binder will work just fine? Get a heavy duty one, make sure it's black, and add a slipcase (available on Amazon
-- just search "slipcases") and you're in business. Amos Media/Scott sells good 3-ring binders (with slipcases!) that will work just fine. Add a label to the spine, if you like. I never liked WA binders as they were much too heavy for my taste. And their plastic slipcases were just awful. I did like their over-the-top page designs with all the colors, large page headings, and so forth.