You do realize that Google is gonna kill that benefit if dumb shits like you keep selling them. They're supposed to be lost leaders for services, so you can generate business, not for you to sell like a fucking cunt.
It's pretty lame you're selling something you got for nothing:
From Google: (They gave all Adwords Certified folks 20 free $100 vouchers)
Gain competitive advantage: Win the clients that you want with an offer of $100 free AdWords credit.
Improve customer loyalty: Build a relationship with clients by starting with a risk-free trial.
No cost to you: Google fully funds the cost of the AdWords coupons and implementation is easy.