IMO, with upholstered furniture you really get what you pay for. Overstock.com, Rooms To Go, and everything else that's not "high-end" is generally crap. Worse, most places like that pretend it isn't crap and charge more than it's worth.
If you want cheap-to-medium quality/price, I recommend Ikea (which, unlike the above, acknowledges that most of its products are designed to be inexpensive and prices them accordingly).
If you want furniture that lasts, I recommend biting the bullet and getting it from a store high-end enough to sell quality brands, like Haverty's (is that a national chain, or just regional?), Crate & Barrel or maybe Ethan Allen. Admittedly, I've never bought stuff from any of those places, but my parents have and their furniture has performed well.
My couch, by the way, was almost bought from Haverty's, but a local mom-and-pop store was able to beat their Black-Friday price. It's made by
Rowe and I've been very happy with it. Even with the deal I got it certainly wasn't cheap, though (~$900, I think).
The above, of course, only applies to
upholstered furniture that you don't want to buy used because of bedbugs. For hard-surface furniture -- or everything if critter infestations aren't a concern for you -- used furniture is the way to go. Yard sales / estate sales / thrift stores are best, but even stuff from an "antique" store will be a better value than almost anything new.