I bought a refurbished GTU10 on Amazon for $115. After a bit of back and forth with Garmin we got it working. Biggest problem im currently having is it isn't working with the android app at all.
As for the tracking beacon, I'll probably be trying that too, I have a ham license a baefong hand held radio and a vehicle mounted radio. As for the legality ofmusing the baefong, it is perfectly fine for you to be listening, you just CANNOT transmit. The only time a person without a HAM license can transmit is during an emergency. So, yes, you can buy the beacon and a baefong to track the signal, just dont push the button and transmit, thats when you get into trouble.