Labels for Education: Campbell’s has given out more than $100 million since 1973. labelsforeducation.com

Pros: Earn points on more than 1,000 products; there’s no limit to how much a school can earn.

Cons: Campbell’s doesn’t give out cash. Labels are traded for school supplies–VCRs to basketballs.

Tyson Project A?: The baby of the big three, founded by the poultry giant in 1999. tyson.com/projectaplus

Pros: Schools can earn 24 cents per label–up to $12,000 annually.

Cons: Tyson has only a few dozen eligible products (one reason it’s given out $35,000 so far).

Box Tops for Education: In just six years, General Mills has given out $70 million. boxtops4education.com

Pros: Schools earn up to $60,000 a year on 800 products, including Pillsbury and Yoplait.

Cons: It takes a lot of box tops to hit that maximum. Each is worth just 10 cents.