Amazon offers its Prime members these adidas Men's Striker Shorts in Cobalt Blue or Navy/White for $5.60 with free shipping. (Non-members can spend $25 or more to qualify for free shipping; otherwise, shipping adds $5.58.) That's $9 off list and the lowest total in-stock price we could find. They are available in sizes S and L to XXL, although not in all size color combinations.
If you're not in the market for blue shorts, they're available in Orange, Forest, or White for $5.61 with free shipping via Prime. That's also $9 off list and the lowest total in-stock price we could find. They're available in sizes XL and XXL, although not in all size/color combinations.

BUY NOW: Adidas Men's Striker Shorts for $6 + free shipping via Prime at Amazon