Healthcare costs can be a significant expense in any of life's seasons, but more so as we age. GoodRx is a very easy way to shop for prescription prices. Simply go to GoodRx.com and type in your prescription name. Hit the search button for all pharmacies and you'll see prices for twelve or so stores. They are also a good resource for finding coupons. And yes, you can use GoodRx for both insurance and Medicare. The toll-free number is 855-213-1275 and the phone number for questions to a pharmacist is 855-344-1842.
I have found this resource to be extremely user-friendly.