Amazon offers Prime members the adidas Men's Sport Performance Climalite Boxer Briefs 2-Pack in Maroon/Black for $12 with free shipping. (Non-members can spend $35 or more to bag free shipping; otherwise it adds $6.72.) That's $12 off and the lowest total price we could find, although we saw them in a different color for $2 less in May. They're available in sizes S to XL.

Sports Authority charges the same price in colors Black/Anthracite, Black, or Blue Grey.