A new law signed on October 10, 2018, makes so-called "gag orders" common in contracts between pharmacies and Pharmacy Benefit Managers (PBMs) illegal. PBMs are the powerful middle men between drug manufacturers and pharmacists and until now, many PBM contracts forbade pharmacists from informing customers when it would be less expensive to pay the cash price for a prescription, in lieu of paying the deductible, co-pay, and/or co-insurance required by the customer's insurance. This resulted in the customer frequently overpaying for prescriptions and PBMs pocketed the difference.
Bear in mind that pharmacists are not "required" to tell customers whether a lower price is available UNLESS THE CUSTOMER ASKS.
So don't forget to ask!