I had the Mopar steps added to my 2012 at the dealership. I have the Powder Coated Black ones. They say RAM on them which is pretty cool. I usually am inclined to think the prices are to high at the dealer for these items but I picked these up for about the same cost as aftermarket.
I do know that the Bully Locking gas cover is one thing that wont fit on the 2012s. I bought one for mine, said 2009 to present on it, and the gas filler bezel is different than the instructions. I could not get it to work so took it back. I planned on trying it on to see the fit and then having it color matched to my truck. Sadly, a no go. So the moral of the story is..Some things wont fit on the 2012 that fit on the 2011.
Here`s the cheapest place I`ve seen the Mopar brand steps. http://moparonlineparts.com/index.php/cPath/26_46_74_167/sort/2a/page/2
Look toward the bottom of the page.
Some of the aftermarket steps have only two mounting points and over time will start to sag if you use them a lot. The Mopars (except for the regular cab) have three. In my opinion, they are much stronger.