It is cubic dollars yes. Think around $9-12k for the Technicsonic 136B which is a single radio VHF P25 250 channels. Programmed with a simple serial interface and a single exe file with a single window that'll probably run flawlessly from Windows 3.1 to Windows 14. Then for their 9100 model with two modules, between $20-24k (varies beyond that with different modules, dualband etc.) Their 9x00 radios are literally APX handhelds fitted into an avionics package with a software interface tieing the APX and the front panel/display together. Programmed with CPS, and all its complexities and drive space, through a modified APX handheld programming cable.
You can imagine maintaining the load/codeplug for a state highway patrol copter, that probably needs to talk to 5 cities worth of trunked systems in its region, various counties, its own statewide agency load, fire and medical rescue, etc. along with any encryption keys.
A lot of DHS ships, FBI etc. are all privately owned helicopters contracted out for exclusive use, or call when needed, etc. Those will have public bids every 1-5 years to renew the contract. Those bids will have avionic requirements listed you can look up. Any company that flies for USFS must have two VHF P25 capable radios in it. More info at
National Interagency Fire Center Also ships flying for USFS will have a standard aux port and BNC to external VHF antenna that supplies PTT and audio from a handheld radio into the audio panel. So someone could bring a BK handheld on board and plug in, and that becomes a temporary 3rd FM radio.