I use the Go Raw brand of Sprouted Watermelon Seeds in this recipe. The best deals I have found have been around $7.99 at Whole Foods and $9.99 at Vitacost. To save $10 on your first order from Vitacost, use this link: https://goo.gl/HB3zII
One bag of sprouted watermelon seeds has 10 ounces, and I use 2 ounces in this recipe. This recipe makes 6 crepes, 3 servings of 2 crepes each, so each serving costs between $0.53 cents to $0.67 cents for the seed "flour", plus the cost of the eggs, vanilla extract, etc.