I am lucky enough to get my hands on a Realistic TRC-86, the walkie talkie they used in the series. Not sure if it works but just to have as display is
Realistic TRC-214 Walkie Talkie – RadioShack | Walkie talkie, Stranger things aesthetic, Stranger things art
Travailler des années 1980 réaliste TRC-214 Talkie Walkie par Radio Shack Dans original Box-Same Modèle utilisé sur Hit Series Stranger Things - Etsy France
Realistic Brand Walkie Talkies, 6 Channel Citizens Band Transceiver, Never Used, Portable Two Way Radio, 5 Watt, 1990, TRC 220 - Etsy | Walkie talkie, Two way radio, Citizen band
Vtg Realistic TRC-214 Handheld CB Radio 3 Channel Walkie Talkie Tested Working | eBay