The Heartpost Letter Club

Heartpost Studio in Folsom, California, built this club around what children do after they open the mail. Each monthly Happy Mail Bundle brings an illustrated story chapter from Pip's world, a personalised letter from Pip with a small mission and keepsake, a creative activity, a themed sticker sheet, a collectible card, and stationery with envelopes so the child can write two real letters, sealed with wax seal stickers.

Prices start at $18.99 a month for one child with shipping included. Options add Forever stamps, an expanded Adventure Guide for homeschool use, or up to four siblings, up to $46.99. Sign-ups are open all month and bundles go out by the 15th of the next month; the first edition is September 2026.

A good match for families who want kids writing letters, not just receiving them.