Ebay offers Under Armour Men's Charged Cotton 6" Boxerjock 3-Pack for $23.49 (reg $50) with free shipping.

Product Descritpion:
Mother nature made cotton, we made it better. Charged Cotton® has the feel of natural cotton, but it dries much faster and stretches way more.

• Charged Cotton® fabric has the comfort of cotton, but dries much faster
• 4-way stretch construction moves better in every direction
• Material wicks sweat & dries really fast
• Working fly
• Inseam: 6"
• 3 boxer briefs per pack
• 57% Cotton/38% Polyester/5% Elastane