Welcome, but still garbage prices relative to the general SSD market. This was the one truly pro-consumer maneuver by Sony where the Playstation trumped the Xbox with their initial strategies. The difference is Sony conceded it was wrong with nearly everything else, and has amended by copying Microsoft the best it could (ex. Playstation Plus overhaul, expanded backwards compatibility, most new games made compatible with older platform i.e. they don't "believe in generations", etc).
Microsoft should do the same. It should just open that up to the whole market. It still won't make it as cheap as regular SSDs, since it's a niche implementation of storage, but prices would be more compeitive if anyone could sell storage carrying the Xbox logo so long as it meets a set of criteria Microsoft finds suitable.