Pay $5 for a $10 Einstein Bros gift card. These guys release coupons fairly frequently, so consider getting this one, then signing up for their emails to really maximize the savings.
Pay $5 for a $10 Red Robin gift card. You could use this one on Tuesdays, when kids eat for just $1.
Pay $7.50 for a $15 Rainforest Cafe gift card. My kiddos really love this place.
Pay $12.50 for a $25 Build-A-Bear gift card. I have a feeling this one will be BEARY popular (see what I did there?!?)
Pay $5 for a $10 gift card to any Brinker International Restaurant. Use this at On The Border, Maggiano's, Chili's or Macaroni Grill. You could save this one for a Kid's Eat Free day, or combine it with the constant supply of Free Queso or Dessert offers to really eat on the cheap!