How to get stupid parents to spend $75 bucks on a pair of crappy walkie talkies:
Make it look like a cell phone. Be careful not to actually call it a cell phone, call it a mobile comunicator or something like that. Give it lots of crappy features like a crappy digital camera, and a crappy text message feature that lots of real cell phone have these days. Heavily advertise the fact that there is no charge for "airtime" or "minutes". Be sure not to highlight the reason there is no charge for these things is that it doesn't use the cell system, it's only got a two mile range and can only "communicate" to other "Chat Now" units.
Sit back and laugh while you roll in the dough.
Genius, sheer genius. If I sound snarky it's only because I wish I had thought of it. Nobody ever got rich overestimating the intelligence of the American consumer.