Rear shocks or all around? If just the rear, I'd go aftermarket with Bilstein 5100s, Eibachs, or Fox 2.0s for a little more.
For the front, I am honestly not sure whether they can just replace the strut part, or if the whoe air spring assembly has to be replaced. On prior Air Rides non-Rams I had, the whole air spring assembly had to be replaced.
That said, I know for the prior DS gen Ram air ride, it was possible to adapt ride height adjustable aftermarket shocks to the stock front air bags. I have not heard of anyone doing that on the current DT gen Ram air ride though.