If you are considering Timbuk2, I just received this 10% off coupon from them:
Timbuk2 Messenger Bags are the must-have fashion item for the new school year.

Choose your own colors at www.timbuk2.com, and you'll have a new custom bag in days!

Timbuk2.com also has:
New Colors for Custom Messenger Bags
New Laptop Carrying Cases
iPod Accessories, and More!

Enter the following promotion code on the checkout screen and get 10% off your order:

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Act soon. Offer expires at mid-night September 6th.

Feel free to forward this offer to your friends.

Thanks for shopping Timbuk2.com, and good luck in school!