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https://www.sparkfun.com/dc-barrel-jack-plug-female.html
DC Barrel Jack Plug - Female - SparkFun Electronics
SparkFun Electronics is an online retail store that sells the bits and pieces to make your electronics projects possible.
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https://en.hooyaelec.com/
DC Barrel Power Jack-Hooya Electronics
Hooya Electronics offers high-quality DC Barrel Power Jack and Round Rocker Switch, known for their durability and reliable performance, perfect for various...
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https://www.adafruit.com/product/2727
MicroUSB Plug to 5.5/2.1mm DC Barrel Jack Adapter : Adafruit Industries, Unique & fun DIY...
The premise of this MicroUSB Plug to 5.5/2.1mm Jack adapter is simple. There's a MicroUSB plug on one end and a 5.5mm/2.1mm DC barrel jack with center positive...