Not so about only one type of E6. Even assuming the discontinuation of Velvia 50 and 100F is global (not necessarily implied by blaming the cuts on falling global _demand_) Provia 100 remains. It's a lovely film and I prefer it most of the time to the exaggerated contrast and saturation of the Velvias. (I like Astia and E100G even better but those ARE discontinued though there seem to be remaining stocks of Astia easily found.)
Originally Posted by PhotoJim
For black and white where price is important I echo the recommendation of Freestyle rebranded Arista aka Foma. Pretty nice film but horrible reciprocity failure for long exposures. Ilford, Efke and Kodak are readily available.