Digikey stripboard

You might call it something else. When you said strip board, I envisioned rows of solder terminals on a board, like tube amps are made on somethings. What your project uses, I call experimenter board, project solder board, experimenter prototype board, names like that.

Digikey may have something like that, but I'd be looking at more hobby focused places like Jameco. I used to use, and still have a stack of, some boards from Radio SHack. Board copper was laid out exactly like their plug in breadboards. The stores are closed, but you can still order stuff from Radio Shack online.

At Digikey I found many hits under Prototype Boards