Where should I look for a cheap (<$400) sofa?

I found this awesome sofa at ikea for $329, but it’s near impossible to get, and is never in, so I want to look elsewhere, but sofa’s seem to be a lot more expensive than I had anticipated. I just want it to be comfy, and under $400. So far, all I can think of is Sears, Macy’s, JC Penny, Walmart (cheap sofa’s, but they’re only online, and how can you buy a sofa without seeing it first?), and I dunno. Any ideas?