Webmaster Forums Biz

These are the following Coupon Codes to get the Drupalvaluehosting packages at half price.
World's Best Hosting Package Discount Code : HalfPriceMonster50p
BlowoutPackage2008 Discount Code : HalfPriceBlowout50p

A good site to use for coupons is:
Retail Me Not - http://www.retailmenot.com

Or if you cannot be bothered to Register on a forum or website:
Bug Me Not - http://www.bugmenot.com

From past experience, I wouldn't say they are 100% accurate all the time though.