I'd go one of those little Hi Point carbines before I went Keltec if going the cheap PCC route.
Why so? The Kel-Ted Sub2K's run really well, can use double-stack magazines, weigh less than the Hi-Point and, most importantly, can fold up to easily fit in a small bag.
I've owned both, and while the Hi-Point carbine is a fairly decent gun for the money, if I had to choose between those two options, I'd easily choose Kel-Tec for this application.