Check out Walmart, if you take a continuing prescription, and can have it in generic!
We just discovered you can get a 90 day
generic supply for $10! Somebody my DH works with told him about it, and we hunted through their website and found it. They have a list of the specific drugs which qualify:
http://i.walmartimages.com/i/if/hmp/...tomer_list.pdf