Depending on your health insurance, this may make a difference in your purchasing routine. I realize there are loyalty point incentives for different vendors. Another factor to consider is the price per pill for different medications, but using British Columbia’s PharmacyCompass, Walmart and Costco also came out on the low-end price per pill of the ten common drugs I checked. (but I can’t say NS prices are the same) Also worth mentioning that you do not need to be a member to use the Costco Pharmacy

But for dispensing fees alone here is how it shakes

PharmacyLow High
Costco$4.49$4.49
No Frills$6.99$6.99
WalMart$8.54$8.63
SuperStore$8.95$8.99
Medicine Shoppe$10.45$13.00
Sobeys$10.95$10.99
Lawtons$11.85$11.88
Shoppers$11.85$11.99
Guardian$11.85$11.91
PharmaChoice$12.10$12.14

The full list of HRM by Pharmacy 

Numbers from Manion Wilkins 2017 Q4 report on fees in Canada