expired Bonds Mens Underwear 6 Pack $39.95 + Delivery @ Groupon
Six pack of Bonds underwear for $39.95 + Shipping. Using the coupon code: HAPPY for another $2 off.
Shipping for me in Sydney was $10, and the coupon code gave me $2 off. Therefore total was around $48. Meaning that each pair was around $8 each.
The unit cost goes down further if you purchase more packs (since the delivery cost doesn't linearly increase).
I only just purchased these, so can't testify to the quality.
Other designs available at: