That price at a Quickie-Lube place sounds about right. The dealer is pretty close to that if you just buy one. I buy packs of 6 for my 6.4 at my dealer and it comes out to about $70 each and includes a tire rotation if I want it. I also can get recalls and updates done at the same time which is convenient.
For $70 I can barely buy the supplies and I'm trying to keep my warranty going so I really like having it done at the dealer. Some people really prefer to work on their own truck and I get it.
So, if you want to DIY, online is probably your best bet for supplies. If you want to have it done for you buy a pack from a dealer. Also, I'm pretty sure you can buy from any dealer in the nation and they are good at any dealer in the nation. They all offer various deals from time to time so don't be afraid to shop around.