Black Dog brand mags have served me well. You may have to go out of State to purchase them. I don't recall seeing 10 r oink und Maryland legal mags available.
I have good luck with CMMG and Chiappa mags. Black Dog does (or did) make a 10 rounder. It is a regular mag with a limiter in it. Easy out of state conversion.
Black Dog For Me as well...Like $13.00 a Pop . I use them with a Stag Arms Conversion in the AR Platform and they ALSO work with My Sig 522.! I got mine from 44MAG.com. NO ADAPTER NEEDED !