Every time I start a new website I get emails from Google with a $100 Adwords coupon code in it. Besides free traffic, at a minimum, I use that $100 to test what headlines get the most click thru rates so I can use similar ones to increase conversions.
Unfortunately I don’t enter these Adwords coupon codes often enough to remember exactly where to paste them in – but I do remember that they are hidden.
To enter a $50 or $100 Adwords coupon code first create your account at https://adwords.google.com. Next click on the Billing tab and Billing preferences.
Then go through the billing setup wizard and on the billing screen at the very bottom of the screen there is a “coupon code” link.
Enter your code and complete the wizard.
It is also important to note that you will get a message prompting you to pay them so your ads don’t end automatically. You don’t have to do that to collect the $100 credit. The way Google words it makes you initially think that you also have to deposit $10 of your money to your Adwords account, but it is not true.