USB Micro B Cable with Data/Charge Sync Switch : ID 3439 : $4.95 : Adafruit Industries, Unique & fun DIY electronics and kits
USB to Micro USB Cable With ON/OFF Switch - 1.5M
ARUSBPWR-05 - 5ft Micro-USB 2.1Amp Power Cable for Raspberry Pi B+ with Built-in On/Off Switch
Amazon.com: MECCANIXITY USB Cable with ON/Off Switch, USB Male to Micro USB Male Extension Cord 2M Black, for LED Desk Lamp : Electronics
Micro B USB In-line Power Switch Cable (Female to Male) | Core Electronics Australia
Micro-USB Cable with On/Off Switch | The Pi Hut
sourcing map USB Cable with ON/Off Switch, USB Male to Micro USB Male Extension Cord 1M, for LED Desk Lamp (Black, Pack of 2) : Amazon.co.uk: Computers & Accessories