if you use my way which i posted couple days ago.
lenovo.com/cpp and passwd 556655.
you should be able to get 15% off instead of 10% e-coupone.
as what i said, it's expired on 5.19.
but even now, you still have chance to get additional $100 from fatwallet.com 15% cash back.
the fatwallet cash back may take aprox. 3 or 4 month.
but it worked.