A.D.
It really depends on what they're looking for...Lowe's and Home Depot have lots you can take home that day in certain sizes and special order on others. They usually have a catalog you can view too. Home Decorator's is good, also owned by Home Depot, but catalog only. Also, many carpet retailers can "bind" the edges of carpet if there's a particular carpet they like and therefore create a large area rug. Crate & Barrel is my favorite for area rugs but they generally only go up to an 8 x 10 ish size. JcPenney is also a good place to try if you're talking washable but their catalog line also has a lot of choices of more traditional area rugs.