http://www.vitacost.com/

I've been using this website now for a couple months to order vitamins and other supplements. It usually has the cheapest price for things on the internet. I personally love the vitacost brand, but check the reviews.

The BOGO (buy one, 50% off deals are always on. They add items every week I believe)

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Automatic ship and save is nice as well! saves some money and time searching for items each month or so.

Also, if you don't want to spend the money on curcumin, buy a bag of turmeric root powder, some empty capsules and fill them. I take between 5-6 capsules a day of the turmeric powder and my migraines aren't nearly as painful or severe now.

Hope this helps!