I just ordered a Cotre CO04D for $17 (plus a $13 programming cable).
jhart99 has a series of posts about these radios, which are based on the very low cost all-in-one Auctus A6 radio SoC.
https://jhart99.com/categories/radio/
He also published some code (in Python) for hacking on these things.
https://github.com/jhart99/a6tools
If I can get this to work, it can be the walkie-talkie thing to talk to the hotspot for a few channels.
