The best way to use ebates is:
For example you want to use NDC.
a few minutes before the drop, click on Nike from the ebates site and let it do the whole start up and open a Nike.com link. Once the link has done its thing just click on your cart even though its empty.
In a new window, go to nike manually or click the countdown link nike tweets. do the whole add to cart process and stuff. once its in your cart go back to the window that ebates opened that is your checkout cart. Complete the checkout process in that window and voila
Also if you use chrome, you can download the ebates toolbar. Any time you click on ANY site that is on ebates there will be a little drop down that shows on your screen telling you how much cash back you get for that site and all you have to is click the red active button thats on the screen.