It pays to shop around. Not all pharmacies charge the same for the same prescription. Even if my insurance is helping to pay for it, it makes sense to me to try to keep the costs down.
The medication in question was Advair 100/50 - and I got quotes from $186.99 to $205.99 for it. I made 7 calls to four different chains and all of them are within 10 miles of my home.