Humble’s Monthly Digital Bundle has always been a great value for PC gamers. For only $12, you’re offered one or two AAA titles that are well worth the cost all by themselves. These games can be downloaded and played instantly, but you also score some smaller indie or classic titles that are unlocked at the end of the month. You also get 10% off every other Humble purchase for the rest of the month. Although the monthly bundle is sometimes marketed as a recurring subscription, there is no penalty to just buying a single month at a time.
Source: IGN PC Articles