I use Canada Drugs.com for my acid reflux prescription. They are not the lowest price for many drugs, but they list the country of manufacturer generics and allow you to choose which you want to buy. (I am not keen on buying generics made in Mexico or India.) My copay for 90 pills here is $121, no generic available. The generic version from Canada Drugs is $64 USD for 100 pills.
My neighbor, who has several medical issues and uses 10 or more meds, started buying from them. She said the cost was about 40% less than from US pharmacies.
For a new prescription you have to mail or fax the prescription along with a medical questionnaire. Their Doctor checks it and confirms your medical history with your doctor. From then on out it's a simple phone call or online for renewals. I usually receive my pills about 2 weeks after placing the order. Oddly enough my pills are manufactured in Canada but are mailed to me from Germany.