I had a little accident and have flat spotted the Roam 30 rim on my Trek.

It's not warranty and while it can still be ridden I would like to replace it, and this is where I have a problem.

How do I get a rim? I can't find one anywhere, Trek doesn't have them, SRAM doesn't list them and I don't need to buy the complete wheel.

Can anyone point me in the right direction?