I'm running Sram Force for years now with no issues. I know the derailleurs come apart in pieces, but am not 100% sure if a LBS can order a specific piece.
You can always look for a slightly used one on ebay which is usually a good value. Especially if it has relatively low miles on it.

I just looked on Strava and my road bike has over 9000 miles, same groupset. But I don't put out a lot of watts......