Lined running pants are used to add warmth to the pants, generally for outdoor running in inclement weather. Linings might also be for wicking away moisture, depending on the material.
Most of the physical stores will sell lined running pants, however, you might find that the stock carried is highly seasonal. You would have better luck online.
Information on lined running pants can be obtained from any retail store that sells them, such as sporting goods stores that sells clothing. Stores that specialize in the sport of running is the best place.
Each person has their own preference as to if they want their pants fully lined. Many people do prefer lined pants.
You can purchase lined pants online from stores such as Cabela's and Old Navy. You can also find lined pants available for purchase from retailers such as Amazon.
http://www.runninggearworld.com/men's-running-pants/ has an excellent article on running pants and why they may or may not be beneficial. They also discuss what types of running pants are best depending on your circumstance.
One can purchase fleece lined pants at a number of stores and online vendors. For example on Amazon, Sears, Old Navy, Cabela's, Carhartt or Work Warehouse Online.
If you live where it's cold.
Top website for running pants would be roadrunner.com. They offer some of the most popular brands of pants and tights for running at very affordable prices.
You can find black running pants in almost all sports stores as well as department stores. Black running pants are the most widely available/ most sold of all colors.
First of all the answer would depend on weather conditions. For example there are special pants designed for running in cold weather. A good brand of the pants is Danskin.
www.altrec.com/pants/running-pants/ has a large variety of both expensive and cheap running tights aimed to provide a very comfortable stride. They also have a 100% satisfaction guarantee on anything the sell, with lifetime returns.
Many retailers sell running pants, both online and offline. Walmart, Target, Kmart, JC Penney and practically any sporting goods store will sell these pants.