Walmart offers two Cra-Z-Art School Quality Crayons 24-Packs for 50 cents. (They're 25 cents apiece, but Walmart requires a minimum order of two packs.) Opt for in-store pickup to avoid the $5.99 shipping fee. That's the lowest price we could find by $6. Each one includes 24 different colors.

Update: It's now available for in-store pickup only.