Edited April 24, 2013
at 06:47 PM
Amazon has the ExOfficio Men's Give-N-Go Boxer Brief in color Black (all sizes) for $13.35 (Currently out of size Small)
If you order 8 pairs (total is $106.80) you can then apply the 20% off coupon APR2OPCT to make your total $85.44. This works out to $10.68 a pair.
Some sizing Info:
My pants size is 36". Size Large fits me well in the waist, a little loose in the legs.
Post has been edited to reflect new (lower) pricing