@noisylungs31 - I would jump on the GoodRx opportunity - I looked back and this year I have paid (my co-pay) between $14.50 and $19.00 under Part B for 7% saline. GoodRx didn't give me any lower price than Part B - the pharmacist told me both prices depend on the brand, strength and "spot price" since it is a medication they do not stock in quantity and since it is not covered under Part D with the specified co-pays (mine would only be $5 month under Part D.)
I use my local neighborhood pharmacy; the pharmacists are very good about getting answers to my many questions. Even so, prior to transferring my prescriptions there, they didn't think Medicare covered saline at all unless it was for diluting another medication.
They always compare our co-pay and GoodRx on each prescription refill & ring GoodRx when it will save money. Even on the few of our meds where it saves us a few bucks a month it adds up over time.