Best company (ies) to write to for coupons?

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My husband and I are interested in starting our family on the Gluten Free diet. Because the foods involved are typically more expensive than our usual brands, I've taken it upon myself to write several companies for help, in terms of requesting coupons and/or samples. Here's what I've heard back so far, just in the last week since I started doing this: Written back, and said they are sending coupons: http://www.bluediamond.com/ Written back AND sent coupons: http://www.annies.com/ http://www.vanswaffles.com/ http://www.barbarasbakery.com/ http://www.nordicnaturals.com/ (also sent a free sample!) *Nordic Naturals sent me a great bit of information on Autism and studies done with their products.