My two nearest LHBS's have kept Danstar prices pretty competitive (~$2 per 11g sachet), even in the new packaging. They are still 40% less than the Fermentis Yeasts here. Prices online are all over the board, so I don't know what to think of what's 'fair'. There's certainly some latitude for the retailers.
At the end of the day, they're low-hassle, high performance yeasts, that are still well below liquid culture prices, so still represent a good value for many styles of beer