Best: Pills
For both prescription and over-the-counter pills, your best bet is Costco. Consumer Reports has done a study comparing prices at 150 pharmacies across the United States and found that Costco was the obvious best choice in terms of price.

Best Pills
Worst: Sunscreen
Sunscreen will only last up to three years before losing its effectiveness. If you buy a multipack from Costco, be sure to check the expiration date and know that you’ll be able to use it up in time. Otherwise, you’re just throwing money away.

Sunscreen