Sorry to hear about your loss.. people suck sometimes.
If you are interested I have a brand new Garmin Montana 680. I took it 4 Wheeling 1 time and didn't like it... I'm not a Gramin guy.. I wanted to be but I didn't like the functionality (or couldn't figure it out). I use a mobile app that works well out in the middle of no-where. I read a ton about different GPS's and for my application this Garmin fit my needs... but loading maps, and using the interface was too difficult (compared to my mobile app anyway).
Anyway I bought it for +$450 from Amazon a few months ago and would consider selling it for $400.. or trading for a new(ish) GoPro.
I also have this mount I'd throw in.
Here is a pic of my Amazon order history with the Garmin.
Hmm for some reason Amazon has these for $569 now... lol maybe its a collectors item.