No sales tax either.
Depending on how much you buy (and if you are tied to taking him shoe boxes) pay for two of the biggest checked bags you can find. Then you can put everything into those checked bags. Usually cheaper than having Nike ship them to your door.
1. Be prepared to be disappointed but pleasantly surprised. It is nice because you can get seasonal and upcoming season Nike products for 40% right now, but in reality, a lot of that product, if you are willing to wait can be had for even cheaper by going to an Outlet or Factory store in a month or so.
2. Go on a weekday if you can. You go on a weekend you might have to wait in a line.
3. Take your time. You can be in there until they close so don't feel like you are rushed.
4. Enjoy it. Not everyone gets a chance to visit so soak it up.