Can I buy a gift subscription to RAR Premium?

Indeed you can! 

Head here to purchase RAR Premium for someone else. You'll have the option to choose between a 3-month or 12-month subscription. 

You can also use this option to purchase additional time for someone who is currently an RAR Premium member (and my, won't they love you for it!).

Gift subscriptions do not automatically renew, so you will only be charged once. Choose the delivery time at checkout.