Amazon, the everything store.
Discount department stores at Wal-Mart or K-Mart.
Building supplies and hardware at Home Depot (find the aisle and bay before visiting the store) or Lowes.
Bulk purchases at Costco with travel deals at Costco Travel.
Googles's shopping.google.com shop and compare webservice.
Computer stuff and alot more at PriceGrabber.
Giant Food's Peapod Online Grocery Shopping and Delivery Service
Take Out meals from FoodNetwork.
Flea Market at eBay
Internet Shopping Mall at BizRate
Another Internet Shopping Mall at NetMarket
More Internet Shopping at Smart Shopping page from Yahoo
Even More Internet shopping at Priceline.com.
Deals (are there deals?... really?) at Overstock.com.
Shop at Crate and Barrel or Brookstone.
Get your textbooks at eFollet.com
Reiters Scientific and Technical Books. Search for the cheapest priced books at

1. abebooks, the worlds largest network of independent booksellers.
2. AddALL and AddALL Used and Out of Print book search and price comparison.
3. ISBN.nu
4. Alibris

More book shopping at Barnes and Noble Books
More book shopping at Powells Books
More book shopping at Greenlight Books in Brooklyn, NY.
Audio, Sterio Equipment Reviews and Classifieds

Lands End
Eddie Bauer
L.L. Bean
Plumbing Supplies.
Shop for consumer electronics at Circuit City, or Best Buy.

House shopping information

1. Price, sell, or rent your property at Zillow.com.
   
2. Look for rentals at craigslist.org.
   
3. Shop for a home at Homes Database.com.
   
4. Shop for a home at Do it Yourself Network.com.
   
5. At Realty Page
   
6. HomeGain You'll be Sold!
   

Automobile shopping information

1. At EV Guide for electric vehicle articles.
   
2. At Edmunds
3. Automobile Buyer's Guide pages
   
4. The NADA JD Powers buying guide Vehicle Pricing and Information
   
5. The Kelly Blue Book Pricing Service.
   
6. The AutoBytel.com Web Site.
   
7. cars.com, used cars
   
8. Car Safety ratings from NHTSA.gov
   
9. Price Car Parts at carparts.com
   
10. All the parts your car will ever need at RockAuto.com.
    
11. Size your tires at Michelinman.com.
    

Travel shopping information

1. Travel reservations including airfare/hotel packages from Expedia.
   
2. Airline reservations from Orbitz.
   
3. Shop for travel options at Travelocity
   
4. More travel options at TravelZoo
   

Computer shopping information

1. Motherboards reviewed at Motherboard HomeWorld.
   
2. Another build your own PC link.
   
3. A site for builders and buyers at the Anandtech web site.
   
4. Components from Intel.
   
5. Printed Circuit Board prototypes from Green Circuits.
   
   

Hardware for various OS's

1. At Lenovo stores, they sell Thinkpads (IBM designed).
   
2. At Dell Computer.
   
3. At Acer Computer.
   
4. At Gateway computer company.
   
5. At Apple Computer products
   

Some computer mail order catalogs

1. At CDW Computer Discount Warehouse
   
2. At MacConnection PC and Mac Connection