Check local pawn shops/gun stores. Many will have a box or 2 of used pistol mags. You will have to ask for the box and then search thru it looking for what you need. Of course, you have to know what you are looking for as most OEM mags are not clearly marked what they fit. Most of the time, they will let you pick up the used mags for $10 or so each. Guns like these are so rare compared to modern production, the mags sit in the store for years until someone comes along and finds the gem.
The only 3rd Gen mag I haven't found in the last 2-3 years is the 1006 mag
Rosewood
The only 3rd Gen mag I haven't found in the last 2-3 years is the 1006 mag

Rosewood