Overstock.com. They have amazing deals on office furniture, dining room sets, couches, and even name brand pillow-top bed mattresses. The best part of all is that shipping is only $1!!! The next time I need a new California King mattress, I will definitely be buying off of overstock.com, as they have some for as low as $700. I have compared prices for months on mattresses and this site has THE best deals. Another great feature is that buyers rate the items, so you can always read what others say about it before you buy it.
This is also a great site to buy Christmas presents off of, and you probably wouldn't need to shop anywhere else. You cannot beat that $1 shipping. Find jewelry, books, CD's, DVD's, electronics, clothing, home goods and more!