Yugster offers this Men's Extreme Weather Wool Blend Socks 3-Pack in Gray/Blue/Black for $6.97. Coupon code "FreeYugBuck" cuts it to $5.97. With $3 for shipping, that's $2.99 per pair and a buck under the lowest total per-pair price we could find for similar socks elsewhere. They fit shoe sizes 6 to 12.
Note: The countdown timer on the product page does not reflect an actual expiration time and resets daily.