Best Buy is offering 100 free RewardZone points for signing up for their Daily Deals email newsletter. (You can unsubscribe after you sign up.)
Go to this promotion page to sign up. (Must have a RewardZone account, which is free to create.) Offer ends 6/8/13.
The fine print:
Bonus points will be deposited in your account by 6/17/13. Reward Zone members, who have not yet subscribed to Deal of the Day e-mails, will get 100 bonus points. Bonus points will not be multiplied. Bonus points will not be awarded for gift card purchases. Offer is non-transferable. May not be combined with other bonus point offers. Limit 1 bonus point offer per membership. Valid 5/26/13 – 6/8/13.