With stock limited by ZIP code, Kmart offers the Sportpet Pop Open Pet Carrier, model no. 58026211, for $7.99 plus $6.50 for shipping. That's the lowest total price we could find by $8. It features mesh sides, a padded shoulder strap, zipper closure, and support for up to 20 lbs.
Of note, Shop Your Way Rewards members will earn a Kmart credit with this purchase and may be eligible for additional credits and discounts.