I found this article about a Burger King promotion going on. These would be great to stock up on. Check with your local Burger King to see if they are participating.
For each $1 donation made at participating BURGER KING® restaurants from Oct. 1 through Oct. 31, guests will receive a booklet containing eight coupons for free value-sized french fries. The net proceeds will benefit the BURGER KING® Scholars Program, which provides educational scholarships to graduating high school seniors in communities across the nation.
See the Article Here