Alright, so as stated there are so many places to shop online. So the trick is to find somewhere where there are people actively competing with each other to drive down prices, hence Ebay. There's always that fear in the back of my head that the deal will be too good to be true, but if you shop smart, you'll likely come out on top. Somethings that you can do to protect yourself are researching the ratings that each seller receives, and also finding out how many sales the person has made. I only shop from people who have all, or an overwhelming majority of good ratings, and those who have been selling for a while. I searched a lot of different internet sites when looking for my wedding favors, and saved a significant amount of money purchasing through Ebay.
If you are looking for a bargain in a store, try Ikea. They carry many different items for you to outfit your home, which range from sofas, to bureaus, to beds, bowls, and even lawn furniture. One of the nice things about Ikea for the design challenged (like me) are the different sample rooms they have. So if you struggle matching your furniture, you can just use their design. Also, where else can you find a sofa for under $200?
One thing to keep in mind is to remember that the prices are low for a reason. I wouldn't go here if you are looking for something to last. However, this is definitely the place to go if you need a starter set.