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well, she'd be the person who I'd share my walkie talkie with! ;-)
Who cares? Nice.
2 Plastic cups, (used to be 2 tin cans), make a small hole in the bottom and join them with a long length of string. Hole the cup to your ear whilst your friend pulls the string tight (not too tight) and speaks in the other end - You can hear over long distances.Other wise, you could use a simple amplifier and microphone and ear phones to make a simple telephone system, if you choose your ear phone and microphone carefully you may not need the amplifier.https://www.instructables.com/answers/HOW-TO-BUILD-A-SIMPLE-WALKIE-TALKIE-FOR-SHORT-DIST/http://www.freewebs.com/acwebpage/Presentations/Walkie%20Talkie%20Lecture.pdfTo be honest I can't find what you might call a very cheap option other then the above. Building Radio Frequency devices is actually very difficult. Going the mores code option with a crystal receiver and a spark gap transmitter is perhaps the least complex option.