At Nautica, search for "5012" to find the Nautica Men's Boxer Brief 2-Pack in White for $8.99. Coupon code "MAY2013" cuts it to $7.19 and bags free shipping. That's $2 under our March mention and the lowest total price we could find by $18. They're available in sizes S to L.
Update: It's currently on backorder with an estimated ship date of 2 to 4 weeks.