These are commercial radios for like public safety etc.
The portables use a different programming cable from the mobiles.
I get mine from RF Guys about $70 USD
The mobiles, I make my own, about $20 USD in parts.
Programmer software, I use 'Programmer Ver. 17, 18, or 20 for these.
This is not like the simple civilian radios like Baofeng, it take a lot of reading the Harris/GE/MaCom programming manuals(several pending the features you want) the radios must have the features you want also.
Most of these are 800 Mhz band and you can't get an FCC license privately.
Lucky, you can find these in UHF band and program them into FRS frequencies.(possibly illegal here)
Sorry, I won't supply hardware, software. or advice how to use these illegally.
73s