I have found pretty much every radon monitor I have seen easy to use.

All radon test equipment follows the same EPA protocol.

What I charge may not have any bearing in your area. You need to charge whatever it takes for you to make money. If I said $19.95, would you then charge that?
I'm not trying to be a smart ass, but what I charge in East TN may be much higher, or much lower than someone charges in PA, or CA, or..... If it matters, call around your area and see what those guys charge.

If you decide to get into the radon testing business, I suggest you get some training, and take the test.

I'm sure your typo was an accident. "lung run"?