Mambo Sprouts has some great gluten free coupons available. $1.00 off a Rudi's and an Udi's product plus $.55 off a San-J product.
Here's the link.
You can sign up for their e-mail updates to get notifications on their latest coupons. I figure with how pricey the gluten free lifestyle can be it's worth saving a few bucks here and there.