Search Engine Forums, SEO Forum

There are people selling this code. I believe one tried here in SubmitExpress..

Promotional codes (also known as coupons) offer a monetary credit to an advertiser's account. Typically, they're given to new advertisers as a helpful way to get started with AdWords. If you're a new advertiser, you might be eligible to receive one.
Time limit to redeem a promotional code

You can apply a promotional code before or after you've set up your account -- but most codes need to be applied within 14 days after your account is created (think of codes like a fresh carton of milk -- they go sour after a couple weeks).

Google can't accept or replace expired codes. But if your code does go sour, don't worry -- you can always activate your account without one.

I remember some people selling this "free" adword coupons but I think it is not advisable.

you can only use one promotional code on one account, imagine if you do well ..then all of a sudden Google finds out your fraud.........it will be more harmful in the long run...