$5 off coupon on back of Kellogg's cereals

Ingles' has a sale on Kelloggs's Froot Loops and Frosted Flakes 21.7 oz boxes 3 for $10. 
I used a $1 off 2 Froot Loops coupon, so I paid $3 per box. 
On the back of each box is a coupon for $5 off any combination of Hasbro board games over $19.99, which expires 9/30/2011. 
Toys R Us is running a sale buy 2 get 3rd one FREE, so you could use the coupon there.