It's really tough now, prices suck.
Some godforsaken stores and flea markets might still have old unsold stock in mama italia. There's an old hi-fi store right here in Bologna that has pretty much infinite stock of high end blank tapes but usually it's pricey.
I'm always on the hunt for old blank tapes, and I believe Claudio/MM is too.
As for quality (not something i strive for usually) and specific brands at this point beggars can't be choosers, try out whatever you find imho.
If you're a pig like me re-record on whatever for maximum filth