Installed a capacitor in one of my units. Charged ...

Installed a capacitor in one of my units. Charged $340 after $50 discount, regular price per the Tech was $390? Such capacitor retails for $20-25 and average charge in DFW area for a Capacitor replacement is $120-$150. It takes 10 min to replace. I will admit they are on time and Techs are good but with that kind of price point hesitant to refer. This was not a weekend or after hour call.