where to buy new blank quality cassette tapes?

I'm sure this has been discussed in the past year or two, so please point me to any threads -- haven't been able to find anything with audiogon's forum search. Some of us still have perfectly functional high-end cassette decks that make great recordings and are more flexible (and arguably higher-rez & better-sounding than a CD recorder). But they need better cassettes than a Maxell UR to sound their best.

I'm certain I haven't looked everywhere, but it seems the closest I can come is Maxell still making UD-XLII, which is a 35 year old tape formulation. Anybody manufacturing and selling high-quality metal tape, or at least the last best type II cassettes??