Block21Prints Snail Mail Club

Block21Prints designs two exclusive stickers for each month's envelope and sends two of each, so you can keep one and share one, along with a card and envelope for writing your own happy mail. The Premium tier adds a Block21Prints greeting card, and Deluxe adds a mystery surprise on top.

Tiers cost $9 (Classic), $14 (Premium) and $20 (Deluxe) a month, and a prepaid three-month gift is available. Enrollment closes on the 20th, and every envelope ships on the 1st of the following month with a fun stamp and no tracking.

A cheerful pick for sticker fans who enjoy sending mail as much as receiving it.