What about a used compressor from a junkyard?
How do you know what's in it? I suppose if one pulled it themselves, and looked at the orifice tube screen first, one might assume it's not full of crap. But otherwise... open it up and check it out, look at the valve petals, see what's inside before putting it on, but that takes little skill and probably an O-ring kit.
It's a $$$ vs. risk tradeoff. I know not everyone can simply "spend the money".