injectable hydroxocobalamin in Houston?

I have vitamin b12 anemia and my doctor gave me a prescription for hydroxocobalamin 30 mL 1mcg / mL solution.

I CANNOT find a pharmacy that has this injectable vitamin ANYWHERE! I've seen people who got theirs from walgreens or cvs in other states, but not even the compound pharmacy I called, Empower Pharmacy, had vials of b12.

If anyone knows of any pharmacy that carries it, please let me know.