Fisher-Price Laugh & Learn Learning Letters Mailbox for $20.99. Shipping is free on orders over $25. If needed, use this Filler Tool to pad the order to qualify for free shipping. Here is a screenshot for your reference. It features three colorful letters to mail plus 26 letters to learn. There’s also a parcel to shake and rattle, and plenty of bat-at, spinning, peek-a-boo, and put-and-take play. Most places have it for about $29.