Amazon offers Prime members the Quicksilver Men's Channel Sandals in Green/Black for $11.93 with free shipping. (Non-members can spend $35 to qualify for free shipping; otherwise, it adds $5.48.) Outside of the mention below, that's the lowest total in-stock price we could find in any color by $10. They're available in most sizes from 6 to 14.
A close price: Quicksilver via eBay offers them in Orange/Black for $11.99 with free shipping.