Are you looking for area rugs? Karistan makes good ones.
There are three types of commonly used fibers: Olefin is the least expensive; other fibers such as polypropylene and nylon are middle of the road, and 100% wool is the highest grade.
I've been looking for a carpet runner for my staircase. The ones I've found locally were all available on this website:
http://www.rugsusa.com/ for about the same amount of money.