Productreductions.com is a great place to start shopping online for discount appliances.  It gives you the ins and outs of which sites are best depending on what you are looking for.  It also tells you the pros and cons of shopping online for appliances.  

You will find several articles telling about online shopping for appliances, and which sites are considered the best.  It also tells when the online stores are offering free shipping on your purchases.
The site productreductions.com is very well laid out and has a lot of good information about buying appliances online.