Ebay offers Levi's Men's 511 Slim Tech Five Pocket Pants for $19.54 (reg. $59.99) with free shipping. 

Product Description:
Our classic 511 Slim gets a versatile, adventure-ready update. With the same streamlined fit that’s narrow through the seat and thigh, our 511 Slim Tech Pants are perfectly calibrated to do just about everything. We designed this version to work as hard as you do, with moisture-wicking, quick-drying fabric, UPF50+ protection, 4-way stretch, and a handy back zip pocket