Hanes offers 50 Pairs of Hanes Men's Tagless Boxer Briefs in assorted colors for $99.90. (Add 10 5-packs to your cart to see this price.) Coupon code "87562" cuts it to $74.92. With free shipping, that's $1.50/pair and the lowest total price we could find for this quantity by $55, although we saw this quantity for $5 less last month. They're available in sizes S to XL.
Jockey Store via eBay offers the Jockey Classic Boxer Brief 4-Pack in five colors (White pictured) for $14.99 with free shipping. That's $3.75 per pair, tied with our mention from last week, and the lowest total price we could find for the same quantity by $18. They're available in most sizes S to XXL, although not in all size/color combinations.