Get the best price online: Price Comparison websites and plugins

Buy Hatke
Pros:
Browser Plugins are good - works with flipkart, amazon, jabong..etc. You can just click on Compare button on corresponding websites
Apply Coupon Plugin - Automatically applies best Coupon on Checkout

Cons:
Its a new site, still needs to get stabilize
Plugins are not compatible with all the websites
Special sale prices will not reflect on the price comparison chart(example: flipkart billion sale prices does not reflect)
Does not take into account special discounts.. like debit-card offers, sales..etc

http://compare.buyhatke.com/

Indian Bookstore
Pro:
Guaranteed lowest price for books

Cons:
Only works for books
Does not take into account special discounts.. like debit-card, sales..etc

http://www.indiabookstore.net/

My Smart Price
Pro:
Coupons, sale information..etc

Con:
Still does not give valid info, i have seen best prices by manual comparison and does not match sometimes

http://www.mysmartprice.com/