user16844: Is there Arduino shields with blocks of 4 pins that you can plug your servos into and use the fourth pin as signal pin to the Arduino Mega board?

user16988: Do you mean something like a sensor shield? They have three pins (Vcc, GND, signal), not four (because servos have three pins), but they are designed for connecting a large number of servos 
These can be found easily and cheaply all over the internet.

16844: <p>Is there Arduino shields with blocks of 4 pins that you can plug your servos into and use the fourth pin as signal pin to the Arduino Mega board?</p>
 16988: <p>Do you mean something like a <a href="https://arduino-info.wikispaces.com/SensorShield#SSM" rel="nofollow noreferrer">sensor shield</a>? They have three pins (Vcc, GND, signal), not four (because servos have three pins), but they are designed for connecting a large number of servos <a href="https://i.stack.imgur.com/60Mf8.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/60Mf8.jpg" alt="Arduino Mega sensor shield"></a></p>

<p>These can be found easily and cheaply all over the internet.</p>
