Rewards for A's

There are many local businesses which reward students for getting A's on their report cards. This is another good incentive for kids to do well in school. Zion's Banks pays $1 for each A for students in grades 7 through 12. Krispy Kreme gives kids a donut for each A (up to 6) for all ages. I've heard that the Tesoro near our High School gives $1 of free gas for each A for high school students, but I haven't tried that yet. What other incentives are you aware of for kids with good grades?