*sings* "Trideo killed the video star!"
Seriously though, Whiskeyjack was right on both counts; trideo replaced TVs/video,and trid is the slang term for it. Much like how you really don't find TV stores anymore (stores that only sell TVs), you would probably be looking at an electronics store, such as Radio Shack (apparently still going strong in the 6th world), or a Megacorp-centric outfit (Renraku or MCT). In the latter case, feel free to make up a name for the subsidiary chain (Stuffer Shack for Aztechnology, etc.).