;D ;D ;D Sorry I stopped selling my +/-15V power supply kit several decades ago... I may have a few boards laying around (but it used the then popular 7815/7915). I cringe when I think I had customers wiring up transformer primaries on open PS boards. AFAIk I did not lose any kit customers to self electrocution.
Yes, If you are laying out a PCB for a design, you might as well roll in the power supply too. Why add wires and impedance that could impact regulation quality.
Back before SMD it wasn't that hard to bread board circuits using through hole parts and I even had some generic bread boards laid out for common opamps. I ate my own cooking and used my generic PS boards to power prototypes. These days not so easy, some of the parts I use now don't even exist in through hole versions.
I'm with Andy any new project I do will usually get it's own PS, unless it's some Frankendesign based on a previous platform. I did one about a year ago with +/-15, +5V, and +3.3V but it was unusually busy with lots of moving parts.
JR