If you live in the U.S. I can give you a $100 coupon. I see your post count is too low for PM's, so send me an email at Dan@FDLMarketing.com.

I also heard that if you start a new Google Adwords account and don't put any money in it, after 5 days or so they'll send you a coupon. Haven't tested it myself. I have more coupons than I know what to do with lol.

People not in the U.S. stop emailing, I can't give out my coupons to non-U.S. residents.

Usually if you have been a member of adsense for a while, Google send you $100 or $75 gift certificates to get you spend some of that money you made with adsense back on adwords.

Most of the time though, the gift certificate they send you wont work for you if you already have an adwords account. So it would be nice to give it to someone who has is just opening a new account.

I dont think you can get adwords coupons any other way. I may be wrong though.

You can find them on Digital Point Forums on the coupons section. There are lots of sellers there who are selling them, but make sure you check their iTrader and customer feedback before finalizing the deal.

Usually your hosting should offer you a coupon. Well I know that Hostgator does at least, but this is only to US residents.