Although I have no opinion about what may be the "best" site for comparison shopping for electronics, I can report that a well-established and popular site, some that I have used successfully, are BizRate, Plaza101.
But I can suggest you Plaza101 - it is the best online shopping community with price comparison facility. At Plaza101, you can easily compare the prices of every product you want to buy. See the link below and experience the best price comparison site.
iShopper.com is another great Comparison Shopping Site in India that provides best option to compare your product within top eCommerce sites.
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Comparing prices and specifications of appliances can be done at such websites as Best Buy, Sears, Amazon, Appliance Mart and other websites that sell appliances.
To purchase discount appliances online you can go to Sears, Walmart, GE Appliances, Amazon, Argos, Lowes, Discount Appliances, Home Depot, Home Hardware and Rona.
There are many places where one could find the best appliance sales online. One could check online shops such as Amazon or eBay for sales on appliances.