Become a MacRumors Supporter for $50/year with no ads, ability to filter front page stories, and private forums.
i would check cnet or pricegrabber.com and use their interffaces to find the lowest price. You will recognize some of the places, I just ordered a i560 canon from newegg.com, they usually have good prices.
 
Register on MacRumors! This sidebar will go away, and you'll see fewer ads.