I know there are some(many?) that are fans of the SmartWool brand so...
Scroll down a bit in the below link
https://www.woot.com/alldeals?ref=w_gw_zl_nd_all&selectedSort=nf
Scroll down a bit in the below link
https://www.woot.com/alldeals?ref=w_gw_zl_nd_all&selectedSort=nf