Amazon offers its Prime members the Fruit of the Loom Men's Basic Briefs 7-Pack in White for $7.82 with free shipping. (Non-members can spend $35 or more to qualify for free shipping; otherwise, shipping costs $5.48.) That's $1.12 per pair, pennies under our January mention, and the lowest total price we've seen in nearly two years. (It's a current low by $5.) They're available in sizes S to 3XL.
Note that these have an estimated shipping time of three to four weeks.