Facebook marketplace is where I shop for beds and gates. I had to replace my gate due to an accident. Ended up getting a 2016 gate on Facebook marketplace for like $400. It was a nice upgrade and the body lines actually match better than the gate it came with from the factory. I just had to get it painted to match. There is a place near New Braunfels that has all kinds of takeoffs...tailgates and beds.
I found my contact in my phone for a guy in Atascosa that had a ton of beds and gates. I do NOT know if he is still operating but here is the contact per my phone....if I recall, they do some manner of upfitting or they by bed takeoffs or something. They had a bunch.
As stated, 2010 is your cutoff for the same body style that will match your current model. The 2011-16 will bolt right up as well, but the style is slightly different.
ALLEN - Tailgate Guy Atascosa
210-724-4675
Another one in my phone:
Julian
Central Texas Beds and Truck Parts
830-743-5065