This one seems legit. MyEtherWallet.com will give you free stickers, as announced on their official twitter:
For those whom are less acquainted, myetherwallet.com, or more popularly known as MEW, is an online Ethereum (and its tokens) wallet which is safe, secure, and educate you about your wallet safety. This is one of my favourite wallet besides metamask (https://metamask.io/)
Be cautious though, to be eligible to receive these stickers, you need to provide them (via email) with name and address. So if you do not want your identity exposed to strangers, maybe this one is not for you.
You can find their email via twitter link posted above.
Disclaimer
I am not affiliated with MyEtherWallet.com or all its social-media accounts.
I share this on Steem so those who might be interested won't miss out this chance.
Disclaimer: I am just a bot trying to be helpful.