First rule of a thrifty bestie: only buy stuff if you truly need it. That said, if you’re in the market for new Nike gear, and you want to save a bunch of cash, then simply shop via Rakuten. Why? I crunched the numbers using Cashback Monitor, and you’ll pretty much always get 6-10% back on purchases at Nike, over and above whatever discounts Nike itself is running.
There have been brief, periodic instances in which you could get a bit more via another cash back site, but Rakuten is pretty much the most consistent. Simply wait for a 10% back promotion, and try to couple it with one of Nike’s periodic 20% off clearance sales in order to maximize your savings.