Quick guide on shopping online (and getting good deals):

Find what you're shopping for.
Comparison shopping sites: google.com, bigwords.com (books), etc.
Check amazon.com, buy.com, bestbuy.com for electronics

See if there are coupons for you to use
Websites: retailmenot.com, fatwallet.com, slickdeals.net

Get cashback on your purchase
Sign up for: fatwallet.com, ebates.com
Other sites I use: luckymagrewards.com (must have subscription), Citi Bonus Cash Back, upromise.com, mypoints.com, live.com, Accenture Corporate Perks, Borders Rewards Perks, airline miles sites
See which one gets you the best deal: evreward.com

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Here's a link to sign up for a free expo pass for Macworld 2010 (Jan 4-8): www.macworldexpo.com/2010registration