A Concoa 312 or 332 isn't really small. What do you mean by "small"? It's narrow but long, compared to the Victor VTS models, and Matheson 8's, which are wide and stubby. The length of the 312's (a bit under 8" with a closed knob) is pretty standard. If that's what you're looking for, there are tons of options. I think of those types as "torpedoes"
When I hear "small", I think of mini regs, which are fairly rare in the industrial models. Not unheard of, just a bit harder to find and more expensive.