I recall that that particular noisy amp was actually a monolithic, fabbed by AT&T, in their brief foray into making their own high-voltage ICs.
I'm thinking that APEX sells to people with lots of money and not much space, like for satellites or something.
If the TCA0372 ever got unavailable, I could make my own mouse-bite board to drop in. There should be enough room, given the wide SO16 package.