Thanks, everyone. Nick, I wasn't aware that Forte and Foma make RC -- for Foma, at least, I don't recall seeing RC in the places that usually sell those brands. As for buying paper on eBay, as you say, shipping can kill you. Adorama isn't that great on shipping, however; a package that probably could have traveled for $5 via USPS Parcel Post cost over $10 to ship UPS 3-day, and they didn't even offer UPS (economy) Ground. Still winds up being less than the best prices I'd previously seen, but I'll freely admit that exhaustive comparison shopping for unfamiliar products isn't one of my strong points.
By the time I get through this box, I'll likely have my printing back to the point I'll want to switch to fiber and start making prints to last instead of just for practice, so I'll have to shop more at that point. I'd really rather use graded papers (I never really got comfortable with VC back in the 70s-80s), but Grade 1 seems hard to find and there's the problem of having to buy three boxes in place of one...