I imagine that if those have built in regulators like the Q grills do, so a replacement is going to be a little pricey. I have never seen one where it just locked up and didn't let any gas through at all. After you removed it from the grill, did you hook it back up to the gas tank and try turning it on?
If you get to the point of replacing it, I suggest you try to dive a little deeper into the troubleshooting. Here is a photo of the Traveler regulator. I would start by disconnecting the different parts to try to isolate where the stoppage is. Start by disconnecting the orifice at joint #3. Then connect it to gas and turn on the valve. If the regulator allows flow, you know the stoppage is after the vale and probably in the orifice itself....you could also easily remove the orifice itself.
If it still isn't getting flow after disconnecting at joint #3, then disconnect the valve at joint #2. Reconnect the gas and see if it is getting flow. If it is, then that would mean the valve is the problem. If there is no flow, then that would point to the regulator itself being the problem. I think joints 1 and 2 are basically the same component, so taking both apart probably would not be useful.
NOTE, when reconnecting the gas source, make sure you turn the gas supply on very slowly at the tank and make sure the valve is turned off (at least for the first step when it is still connected to the assembly.
Also, exercise due diligence and caution as you will likely experience raw gas flow at some point.
Replacing or cleaning the valve or orifice would be a less expensive fix than the whole regulator assembly. When you put it all back together, just be sure to use tape or preferably pipe dope on the connections.
One other thing to check is that gold pin where the hose/gas bottle connect (Green arrow). If that pin is missing, it will not open the hose or gas bottle to allow flow. They get broken off easily.
Nice score.
