Check out this collection of hats and get pairs for under $15 when you sign up for or log into an Adidas account at Adidas.com. You'll also get free shipping, which saves $4.99 in fees. These are the lowest prices we found anywhere. This Adidas Saturday Hat originally sold for $20 but drops from $12 to $10. You'll spend $4 to $6 more for this hat at other stores. Sort from the lowest to the highest price to score the best deals.