Humble Choice brings you 12 games for a fixed price every month. So, for many people the first Tuesday of the month is Humble Hype day - as a new bundle is released with a semi-random collection of indie games. Sometimes great titles, sometimes less so - but it's generally a pleasant surprise of mixed games for a decent value. Let's look at a few titles for the current month.
In general you'd pay about 9-12$ for 12 games depending on the deal you get from Humble when you pause a month. Otherwise it's around 18$ a month. You can always pause, and see whether you like the games - otherwise they unlock and you can simply claim the whole month and get straight to playing.