As of May 2014, the price of a Forever stamp costs 49 cents. This  price comes after several price increases of stamps. It was last  known to cost 46 cents.
A trench is a type of excavation or depression in the ground that is generally deeper than it is wide (as opposed to a wider gully, or ditch), and narrow compared with its length (as opposed to a simple hole). In geology, trenches are created as a result of erosion by rivers or by geological movement of tectonic plates. In the civil engineering field, trenches are often created to install underground infrastructure or utilities (such as gas mains, water mains or telephone lines), or later to access these installations. Trenches have also often been dug for military defensive purposes.
This is where excess crust is subducted and melted as new crust is produced at oceanic ridges. Deep-sea trenches are areas of plate convergence. Volcano locations (red squares above) match closely the regions of trenches (subduction zones) and oceanic ridges (spreading centers). The trenches have crustal friction near the surface and deep into the crust as subduction forces one plate under another.