At Carters.com, select underwear and socks for babies and toddlers are buy one, get one free. Shipping starts at $6, or it's free on orders over $35. In-store or curbside pickup is also free where available. For example, add two of this boys' 7-Pack of Cotton Briefs to your cart and get both for $26. That comes out to around $1.86 per pair! That's the lowest price for this brand anywhere. A similar deal on this girl's 7-Pack of Undies is also available. Sales tax is charged in most states.