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.
A ditch is a long trench or pit dug into the ground. If your lawns are always soggy, build a drainage ditch for the excess water to flow into. A ditch can be a man-made trench, usually long and narrow, dug into the earth, or a natural ditch made by flowing water. Originally used for farming, we now use ditch for any pit in the ground. Ditch can also be a verb meaning to toss something or forsake it.