Amazon offers Prime members the Dickies Men's Fleck Yarn Cuff Knit Skull Cap in Black for $10.99. Coupon code "30CLOTHING" cuts it to $7.69. With free shipping, that's $7 off list and the lowest total price we could find. (Non-members can spend $35 or more to qualify for free shipping; otherwise, it adds $5.48.) One size fits all. Deal ends December 22.

Orders placed via Prime by December 22 are guaranteed to arrive in time for Christmas. (The deadline for standard shipping is today, December 19.)