Can you believe the cost of this prescription?

My wife has sleep apnea and takes one Lunesta to help her sleep. Recently, Walgreens came out with a new prescription program, where you can have your script filled for 90 to save you money. Save us money? Her 90 day refill of Lunesta cost $789.00!! Where is the savings in that? I can only hope that a generic will soon be on the market. Question: is Walgreens taking advantage of their customers with this 90 refill program? Is there a cheaper way to buy Lunesta? Have you have a similar situation with Walgreens?