Amazon has the 6-Pack Hanes Men's Work Socks (Black) for $8.79 - $1.50 off coupon (check “Save an extra” box, eligible on first S&S order for this product) = $7.29 with free shipping on $35+ or with Prime (extra 5% off with 5 items S&S order). Made of 50% polyester, 49% cotton, 1% spandex.