Goodrx worked great for me, I been using it for awhile at walmart, walgreens and cvs and it has worked everytime. My docter gave me a prescription for 20 pills and the RX coupon was only for 9 so cvs let me get the 9 pills for only 15 dollars and I can go back at a later date to get another 9 with the coupon. I have also got prescription from walmart with Goodrx for only 4 dollars so it worked great for me