As a newbie I have scoured this site and many dealers to find what to buy at the right price. I have found the following links helpful:

Canon Lenses - price list:
http://forums.clubsnap.org/showthrea...131801&page=11

Sigma Lenses for Canon - price list:
http://forums.clubsnap.com/showthrea...=145126&page=2

Tamron & Tokina Lenses for Canon - price list:
http://forums.clubsnap.com/showthrea...=145372&page=2

Canon accessories price list - price list:
http://forums.clubsnap.org/showthrea...=154099&page=2

Canon on discount - The Oracle:
http://forums.clubsnap.org/showthrea...=199883&page=2

CF memory card - price list:
http://forums.clubsnap.com/showthrea...84#post2359884

List of price guides for e.g. bags and tripods:
http://forums.clubsnap.org/showthrea...ight=pricelist

List of camera/package prices:
http://forums.clubsnap.org/showthrea...CF+card+prices

For a discussion on what lens to buy, I suggest the following:
http://forums.clubsnap.com/showthread.php?t=210509

Outside of this forum I suggest the following on lenses:
http://www.the-digital-picture.com/Reviews/