There are large NIKE outlet stores in ALL of the outlet malls in Orlando/Kissimmee. All have good selection of clothes, shoes and sporting goods, like bags and balls.
Plus there is a real Nike outlet on Rt. 192 in Kissimmee, where they get all of the left-over shoes and clothes from the retail stores, including top quality golf shoes and soccer cleats. If you are staying in Kissimmee, don't miss this one.
Adidas can be found in the Prime and Premium malls. It's not cheap but it's the quality you know.
Puma is in both outlet malls, but it's the worst kind of outlet...random leftovers mostly. My sons love the Puma brand; and we have never found anything to buy here.