Trout Fishing Flies and Salmon Fishing Flies. The Essential Fly sells flies at approximately one third of the retail price of major retailers! Of course we ensure you receive excellent flies manufactured from the best materials available. Our focus is on quality, price and service. Our Fishing flies include Brown Trout Flies, Rainbow Trout Flies, Dry Trout Flies, Wet Trout Flies, Trout Lures, and Sea Trout Flies. We also manufacture bespoke flies tied to your own specifications with any volume.