http://www2.costco.com/Pharmacy/DrugInfo.aspx?p=1&SearchTerm...
The one that costs $17.22 for 50 100mg tablets? Sounds like you might be getting ripped off wherever you bought your medicine.
I just called Costco for you, and the price of 30 generic 200mg extended-release tablets is $397 for members and $408 for non-members.
Edit: spelling
I just called Costco for you, and the price of 30 generic 200mg extended-release tablets is $397 for members and $408 for non-members.
Edit: spelling