We have Moto 1020. I'll see if I can find the approved list. They need to take a long look at the requirements and hopefully rewrite the policy. The CUSA crew that came to the Alamodome this last Saturday were using cheap FRS Midland radios, about $20 apiece. If a D1 college crew can use those, I'm not sure why Texas high school guys couldn't.
The less expensive radios I found were not approved by TASO, although they met every requirement but full-duplex, essentially making the radio function just like a telephone, two way communication at the same time. These little radios won't even let you transmit if someone else is talking so full-duplex is unnecessary. Radios really add a new dynamic to communication, making it immediate, clear, hopefully concise, and without having to run around all over the place to get numbers and explanations. It speeds the game up for sure.