Well the effects of Polaroid discontinuing film are becoming obvious. For large format films, B&H only has Type 52 listed. Could not find any on Calumet except a Fuji 4x5 film.
As for Spectra, have not seen it anywhere except eBay.
Pack films 664, 669, and 690 are still available from B&H, Calumet and 664 is in stock at Freestyle with others on back order
Scablab (I can't remember how to link anymore) turned me onto a Polaroid TZ film (Variant of SX-70 at Freestyle). I promptly bought 3 boxes about a month ago, just checked their site this evening and it appears to be gone.
600 film is still widely available.