This month's bundle includes Project Cars II, Just Cause 3 XXL, Wizard of Legend as early unlocks. Just looking at Project Cars II alone this appears to be the best price ever.
Unless you want to subscribe, remember to cancel your subscription once you've redeemed the Steam keys - you can keep the games even if you cancel.
You don't have to redeem your Steam keys before you cancel. Provided you're purchased/paid for the monthly bundle, any games and their keys are yours to keep forever. Even the keys which haven't been revealed yet.
While you have until a week before the first Friday of the of the next next month (7 days before the first Friday of February if we're talking about the January bundle) to cancel provided you don't accidentally early unlock next month, I suggest you cancel as soon as you've paid for 1 month if you don't want to subscribe to avoid forgetting. (Although I think you do lose access to the Trove and 10% discount the moment you unsubscribe.)
https://support.humblebundle.com/hc/en-us/articles/217300887…
If anyone does want to subscribe for a long time, you just missed the $99 for 12 months. (It still shows but the timer has run out so purchase will probably fail.) But they've already run that promotion twice so I expect they'll probably do at least once more either before the end of the year or just after.
Note if you purchase 12 months you can still pause any month (except the first) before 7 days before the first Friday provided you don't 'purchase' the bundle to get access to the early unlock. You obviously only have the early unlock to guide you and you need to do this every time.