The consensus seems to be: live with nasty etch chemicals, or send out your PCB design to a fab house. Even for a one-off.
I hauled out a handy Adafruit half-sized "perma proto board" to use as the P/S' new permanent home, only to find out that although it looks like a regular breadboard, the hole spacing is actually different -- so that the bb power supply doesn't fit on it! The error is not so small, over the nearly 2 inch span it is out by about 2 holes.
It looks like most "real" protoboards have 0.3 inch between the vertical strip and the horizontal strip, to account for the volume of plastic in the mating pieces, while the Adafruit permaprotos have a more aesthetic and compact 0.2 inch gap (since they're all one-piece high-strength fiberglass anyway.)Never noticed, and I hadn't thought about the pre-made power things not matching - you might mention it to them - I don't know that they'll change it, but it would be good to have it pointed out.You could easily have 10 boards that match your requirement exactly (as long as they don't exceed 100mm length - about 38 positions) made for about $3/board... You can even download the Adafruit design files and modify them as needed...Also, I have an EAGLE ULP where you "run protoboard", specify the number of rows and where you want power rails (inside, outside, both), and it'll plop down the design on a PCB... It currently uses the 0.3 inch separation for outside power rails...
The Sparkfun permaprotos pictured above have the "correct" spacing between the circuit holes and the power holes, so a 'breadboard power supply' fits just fine.
Not that it is much use other than a way of connecting a USB lead to provide 5 V