The only company that I know of which still offers a "standalone" GPS for analog emissions is IDA company - www.idaco.com The stuff works, but it's not a 'cheap' solution.
I'd also tell you that if you're heading in that direction - why limit yourself to MURS? Get a real part 90 license & go for something with some legs. No sense spending for a self contained GPS solution that's only good for a mile or two, and have to deal with trying to integrate it with MURS limited equipment (your EVX radios are still not MURS legal if you're running something with a detachable external antenna - which you'd pretty much need in order to throttle it down to 2 watts.)
There used to be a few companies that made a WiFi based GPS solution, where the vehicle would have a GPS antenna & receiver that would collect tracking information throughout the day, and whenever the vehicle returned within the range of the Home Base/Transport Garage - the WiFi would connect & download that day's info. Not exactly real time, but it did the trick for History Logging. It would also work within a few hundred foot radius if you got the WiFi access point up high enough. Not sure if you could make something like that into a real-time tracking setup, or if there's anyone still making that. I haven't seen anyone trying to re-sell any old turn-key systems via Ebay or anything.
There's a few units offered for sale that plug directly into a vehicle's OBD-II port & work through Cellular data at a fairly low monthly cost.