Disney Store takes 40% off a selection of toys, apparel, and housewares via coupon code "BOUNCE40". Shipping starts at $4.95, but orders of $50 or more qualify for free shipping via coupon code "SHIPFREE". Deal ends April 19. Some best bets, with prices after coupon:
Amazon offers Prime members the Disney Cars Kids' Flip Flops for $2.70 plus free shipping. (Non-members can spend $35 or more to qualify for free shipping; otherwise, shipping costs $5.48.) That's $9 under the lowest total price we could find for a similar pair of flip flops. They're available in sizes 7 to 12.