When my son was diagnosed (several years ago) I thought we would find much better pricing at Costco for our expensive meds. To my surprise, when I price-tested their pharmacy, I did not find any advantage in general for prescription meds. Being, at the time, a Costco aficionado, I was quite surprised. Their OTC stuff, for meds, is very well priced, but their prescription meds I don’t think have an advantage over the board. Too bad, really.