and lastly for the moment a cheap android phone. it will become a requirement as things develop.
t-beam ~ $25-45
t-deck ~ $50-70 depends on your insurance on the device
HF radio ~$250-1500 + you pay for quality and capibility.

this is just go give you a base idea there will be more to buy to get everything up and running. this is why i recommend building this out with a community where everyone chips in so nomatte what you can stay in the loop with other communitys around the world. (yes you can use HF to send signals around the world.)

keep your eye and ears open and always keep your head on a swivel.