Whoa, hold on.

Things like radar detector / wide band receiver are very unlikely to happen if a small scale tuner run is done. A run like this will only produce RioCar tuner clones and nothing else. Not saying it will never happen, but if I have anything to do with a tuner run it won't.

Remember there would be a fair amount of R&D involved in this sort of stuff. Also remember that in some places in the world (like Oz) things like radar detectors are illegal.

In terms of price, I'm (wildly) guessing (and hoping) around US$150 judging by what other people have said. I am still waiting to find out a price on the actual pre-fab tuner modules from Microtune.