I often have to call each pharmacy to check out the price differences. I recently found this place and they give you each price for each pharmacy in your area. Very nice. They also offer a look up for pharmacies in your area too.
I know with today's economy it is important to get the best prices and this helps us do that.
I hope it helps you as much as it has me:)
http://cashcard.lc.healthtrans.com/Pages/default.aspx?host=default