The following may not be news to some, but it was to me:

1. I just discovered that one can use the Costco pharmacy (in both USA and Canada) without having to be a Costco member.
Apparently Costco's Rx drug prices are at the low end of the spectrum compared with many other chain pharmacies.
Of course, in Canada pharmacies follow their provinces' drug formularies vis-à-vis pricing, with any price differentials being due to dispensing fee and ancillary services offered.

2. In the USA there is also available an app called Blink from Blink Health which can determine the best pricing on Rx drugs. Apparently ca 70,000 pharmacies will honor such pricing.

3. Also in the USA one might do better to buy Rx drugs with cash rather than going through one's insurance, the co-pays on which can be exorbitant.