Home Depot ironically installs carpet for $139, any size, any carpet, any home. It is right on the carpet section of the website.

Obviously you must buy the carpet & padding from Home Depot to get the price.

http://www.homedepot.com/webapp/wcs/stores/servlet/ContentView?pn=Low_Price_Carpet_Install&langId=-1&storeId=10051&catalogId=10053&cm_sp=dept-_-d23-_-Carpet-_-hero-_-installation_image&locStoreNum=3640&marketID=45