Joss & Main is a store I've mentioned before over here, but it's worth mentioning again. It's a flash sale site, so you are sure to find unique pieces that you won't see in just any home! It's a lot of classic furniture, patterns, and more. Love this store.
One Kings Lane is also one that I've mentioned before. It's another flash sale site that you get a free membership to, and then shop to your heart's content. They change their sales every few days, but right now they have a beautifully curated collection from John and Sherry from One House Love.
World Market has a similar aesthetic to West Elm, but the furniture is much cheaper. Love their style, especially their wood furniture.
Ralph Lauren has come out with some amazing lighting and furniture (like the architect lamp above). They've got a similar style to West Elm, but it's a bit more... focused. I really like their clean, eye-catching style.
Kohl's Home. Which you might be surprised by. But they have some really amazing pieces at low prices. What I love there are the products that are more simple--nice lines, solidly built, and with a price tag that I can afford.
Touch of Modern is a store I've just discovered that I quite simply love. They so carefully choose their items, and you can always find the coolest furniture and home accessories there. Highly recommend a look if you haven't been there already!