Sign up for AdWords and receive a $50 new account credit to kick start your advertising, note is this for new customers & the activation fee of $10 will be taken out of your credit.
$50 Credit For Google AdWords
40
Referral Links
Google One: random (159)
Targeted offer: Referee gets 75% off first 3 months of Google One. Referrer get $7.
Related Stores
I guess it is only useful if you have a website/product that you wish to promote via Google's AdWords? $50 can go a long way though, if you are prudent with your keyword selection.