There are plenty of places you can get authentic jordans. Any of these chain stores such as Finishline, Olympia, Fottlocker(and of couurse if there is a Niketown near you)etc. would not sell fakes....
I bought one pair of nike shox for my boyfriend there with really low price. www.shoeshipmart.com. Also you can try ebay or zappos. But the price is a little bit higher.