I am purchasing a front and rear deck from a local company here in the ArkLaTex. They came out and gave me an estimate with an artist's conception of what it will look like when done. Here is link to their home page with pictures of decks for MF homes http://www.sunsetdecks.org/MobileHomes.html I'm sure if you check your local yellow pages you can find a company that will have some literature along with pictures.
You can also go the web site for Lowes and maybe even Home Depot and there is a program that lets you design your own deck and will give you an estimate of the materials. The program is free.