Try going to pharmacychecker.com (they're endorsed by the AARP) and see about buying your drugs over the web. AstraZeneca sells a version of Nexium overseas called Neksium, which retails a bit cheaper.
Make sure to tell this to your doctor and show them whatever your receive. While they can't send the perscription for you in most cases, most will understand that cost is a factor.
Thanks for the advice........Happy Thanksgiving!!