Rakuten is offering 90% cash back at LifeLock, or 90 American Express Membership Rewards points per dollar if you have your earning style set to receive Amex points rather than cash (which you should, since Amex points are worth more than a penny apiece).
The LifeLock Ultimate Plus Plan comes with a '25% discount' off the normal $26.99 per month. All-in with taxes you're looking at $296.90 for a year. (HT: My Points Life)
You'll earn 26,721 Membership Rewards points for the purchase, plus new members earn 3000 points with their first transaction of $25 or more. So a total of 29,721 points are on offer.
Oddly this isn't the best deal they've ever offered. Last July 15 (one day only) it was possible to earn 120 points per dollar.
LifeLock is the company whose CEO published his social security number to demonstrate the power of his system and dared hackers to steal his identity. Which they promptly did. Thirteen times.
Nonetheless they advertise broadly a credit monitoring service and help to fix things if your identity is stolen. Of course you can check your credit report for free, and you can call your credit card companies, you don't really need them to keep a list of cards and card numbers for you, but some people find it convenient.
Once you get a credit monitoring alert, if your ID has been compromised you're being notified after the fact. Trolling the net for instances of your social security number with a Tor browser isn't likely to do much either.
They used to put an automatic freeze on your credit report, and continually renew the freeze, and wound up in a lawsuit over doing so (since they did it for all customers, versus when there's a legitimate concern of identity being compromised).
Still the service may be useful for people who find looking through a free credit report and making sense of it too complicated. For most though in my opinion you won't want to keep LifeLock. But you may want to cancel and do a deal again with them at some point in the future.