You scared me, so I looked. rockauto shows them from $99 to $145, and they usually have what they list. The killer is shipping costs (2 ways w/ core), so too bad your local auto parts can't get. The Cardone choice ($99) has you ship yours first so you must manage min 2 weeks out-of-service.
If my self re-build doesn't work (see my post), I will be in the same boat, otherwise I'll continue that approach. So far, I spun the pump with an electric drill and seems to work fine. I recommend getting a spare (I have) since "small shaft" ones may get rare, and people almost give them away now when converting to manual for headers. Rock shows a manual rebuild as $383!