I need five examples of websites that use tabs at the top of the
screen as navigation (e.g Amazon), alternatively two sites that sell
templates for creating tabs for use on a website.

Hi there helpme1:

I've found quite a few sites which use tabs for navigation.

1) http://www.apple.com --> The main website of Apple computers

2) http://www.imdb.com --> A massive movie information database.

3) http://www.barnesandnoble.com --> An online bookstore and more,
similar to Amazon.

4) http://www.walmart.com --> Huge American and international
retailer.

5) http://www.ebgames.com --> A large retailer of computer and console
games.

And two bonus sites!

6) http://www.jungle.com --> A big-name E-commerce site in the United
Kingdom.

7) http://www.etoys.com --> A website which sells all manner of toys.

And I know you said alternatively, but I can begin to help you with
the templates too. Google maintains a large listing of companies who
sell website templates. You can begin browsing at:

http://directory.google.com/Top/Computers/Graphics/Web/Templates/

I hope this is what you're looking for. Please feel free to request
clarification before rating this answer, if anything is unclear.

Thanks, and good luck

--seizer-ga

Search strategy:

sites using tabs
amazon lookalike site