The information from this article is from a fan game or fan fiction and is therefore not canon.
Radio Shock is a store based on location of the same name in SQ4 (floppy version)
Background
Radio Shocks are everywhere and are known for being the best in price and the best in service. Roger visited another Gallaxy Gallaria mall in the Space Quest IV.5 era in order to buy an underwater flash light from Radio Shock, and a range extender for the Aluminum Mallard's SPRINT Transporter Systems.