I would charge around 20$ but here's the kicker:
I would go to the customer's home with only my Blu-ray player and my World of Wonder dvd.
Since it's so easy to adjust tv settings with it, I'd be out in less than 10 minutes.
I obviously don't have ISF pro calibration tools.
Is it a good idea to make potential part-time income?
Would customers say: "What? 20$ for 10 minutes calibration with your dinky Blu-ray where I could've done it myself for free? GTHO!"