Guess it depends on what kind of oil you use, and how much DEF pee they need to top it up.
We used to have a package that included conventional oil and 2.5 gal of DEF. I think it was about 119 bucks.
Costs me almost $100 to buy the syn oil and motorcraft/racor filter for my 6.4.
Thing I like about getting it done somewhere is I don't have to **** around trying to get rid of the used stuff.