Shopping
You can find greatest deals in Mysimon for electronics and home appliances
Dealtime is good for Cameras, Computer products, chord less phones etc.
Half.Com also gives great deals
Check Ebay if you are interested in auctions
Ubid also a good auction site.
If you are looking for business related and technical books, you can get good deals at Fatbrain
In general Barnes and Nobles is good place for all books.