Connect the standard USB end to 5V 1A USB port power supply or 5V 2A USB port power supply and Micro B end to Raspberry Pi and you have a switched Pi. This cable is also suitable for any product with a MicroUSB port. The cable does not transmit data, so it is mainly used for powering and charging the device.
You can order USB Power Cable - (Internal Power Switch) from SAMM Market with the advantage of reasonable price, same day shipping and fast delivery from Raspberry Pi Power Adapters category.