Although it would be correct to say the .38 S&W is obsolete,
In the sense of new guns, yes. Ammo, though, is still available from Remington, Fiocchi, Magtech and Winchester. All are bullets in the 142 - 146 grain range.
About the .38/44 being a more robust loading of the .38 Special.....I didn't know that. Learned something, I did. I was thinking along the lines of the .38-40 or the .357/44 Bain & Davis.