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
Vintage Realistic Trc-214 Cb Walkie Talkie Communication Crystal Radios | Mobile audio, Walkie talkie, Radio
Walkie talkie realistic trc-218. 3 canales. - Sold through Direct Sale - 49279205
Vintage Realistic TRC-219 Walkie Talkie 3 Channel CB Radio - Radios - Burnaby, British Columbia | Facebook Marketplace | Facebook
Vintage Walkie Talkie - REALISTIC TRC 219 used by Mike Wheeler (Finn Wolfhard) in Stranger Things | Spotern