If they are discounting the price, it is for a reason :-p
Don't buy cheap stuff, if you want a cheap shirt, or to save a few dollars on bootlegged VCD's, thats one thing. But when you are buying new phones, electronics, computers, you should go to Broadway or Fortress. And I have had problems with other electronics stores ("Suning" is REALLY bad and their customer service will never reply to you) in the big malls, so beware. Broadway has been fair to me and even given me a refund on some items, in addition they usually tell you a cheaper price if it's possible and provided you ask. Fortress has been ok as well, and replaced defective parts post purchase and I was able to avoid the traveling to customer service warranty centers.
Any other store is at risk for being a fake, or having the internal parts removed and replaced with lower quality parts. People will do anything for a buck, so don't try to justify that they wouldn't do that.