Apple Authorized Resellers frequently have the best deals on Mac computers and laptops. The big names in the game include: Mac Connection, Best Buy, B&H, and Abt Electronics.
There are a number of advantages to shopping at these stores. First off, they provide discounts on the retail price.
The next big advantage to buying from online retailers is free software and rebate offers such as free trials of software and rebate offers for free or discounted printers or accessories.
Best Buy even has started offering exclusive weekly discounts on select Apple products to members of its free My Best Buy loyalty program, kicking its special deals off with up to $200 off select Mac Book Pro models. If you're in the market, it's worth signing up.
A quick note: if the website you are looking at has a shoddy design and the prices are too low to be believed, it probably isn't an Apple Authorized site and may not be a trustworthy business. Any site you see on Brad's Deals is safe.