Walkie Talkie in the Helmet

I have an idea... I want to have the ability to chat with a buddy of mine who is also in a costume during our ComiCon trips. The reason is we get separated within the first few minutes and can not keep track of each other.

Does anyone have any ideas on how we could add a Walkietalkie option into the helmets? Does anyone know of a compact option??

Far more simple solution would be to get a headset for a walkie talkie set that you can link in this way. I bought my headset for 8$ and simple walkie talkies can be 25$ a pair. You could also simply link in your cell phone which is what I did.

That's a good idea to keep in touch. I like the headset plan