Can't get enough of these 1 foot extension cords:

https://www.amazon.com/gp/product/B013H8VIEI

This rotating power strip is also pretty handy, even has USB charging ports:

https://www.amazon.com/gp/product/B00OJGBJYC

While we're on he subject, a 2-port USB car charger with 2.4 amps per port:

https://www.amazon.com/gp/product/B006SU0SX0