how often does humble bundle change?

[Woahduds]

bought my first last night and cant wait to buy it again. 

[PokémonTrainerFour]

either weekly or bi-weekly

 

you can check out other sites like BundleStars for other bundles though

[KomradeKarebear]

It depends, they've been doing lots of flash bundles lately and those have been available on Mondays. The big bundles vary though. And weekly bundles are a bit sporadic too. Pretty frequent though. Set up an account and you'll get emails when they update.