Jet offers its members the Munchkin Traveling Flash Cards for $5.45 with free shipping. That's the lowest total price we could find by $2. It features 40 cards with 80 images of animals, shapes, colors and numbers in English and Spanish.
Note: At checkout, you'll be provided with the opportunity to waive the free return option, which further drops the price to $5.34. Plus, select payment methods bag additional percent-off discounts, as displayed at checkout. (For example, paying with a debit card cuts an extra 1.5% off.)