What’s the bandwidth for this?
I guess the cheapest is 2-m ham, but what would be the transmission speed for text?
2 meter AX.25 packet is typically 1200 baud although you can go to 9600. These are what’s normally used for bulletin board systems (BBS).
So-called High Speed Multimedia (HSMM) uses adapted WiFi routers and has broadband capability.
So-called sound card modes with error correction like MT63 can go to 200 wpm and will work at any HF/VHF frequency.
The Winlink Winmor mode (HF) is slow but you can send an email of a couple hundred words in under 2 minutes.