Lids takes 50% off a selection knitted hats. (Discount applies in-cart.) Plus, all orders bag free shipping. (It usually starts at $5.)

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A couple of best bets:
-- New Era Unisex Golden State Warriors NBA Knit Hat for $15 (pictured, low by $25)
-- New Era Unisex New York Giants NFL Snow Dayz Knit Hat for $15 (low by $7)