For in-store pickup only and with stock limited by ZIP code, Kmart offers the Hanes Men's Short Leg Boxer Briefs 4-Pack
in Black/Gray for $3.99
. That's $1 per pair and the lowest per-pair price we've seen for Hanes boxer briefs. (For further comparison, it's $10 under the lowest total price we could find for a similar 4-pack shipped.) Sales tax is added where applicable. They come in sizes S to XL.