I haven't found it yet on the 1-ton Ford trucks we have at work. And they give us the "MyKey" which limits radio volume.
The base Ford Focus didn't have it a couple years ago when I briefly looked at the $12995 Scrooge-McDuck edition. And it had throttle-by-wire so it was just a button and some programming.
Family rented a stripped down Prius C which didn't have cruise control. Great for fuel economy, but a pain when we had to take it on the freeway.
When I got that Mazda2 without cruise I wish I had noticed it when I first got in the car at the rental place, because we had to drive it from Fort Lauderdale to Fort Myers (and back) along Alligator Alley and that long stretch of highway just begs for cruise control.
I've rented cars that didn't have it.
The most basic economy models may not have it. But if you rent a "mid-size" or "full size", you're almost guaranteed to have CC since those types of cars have it as standard equipment (Malibu, Elantra, Camry, Altima, Sonata, etc)