Where can you buy the Humble Indie Bundles?

http://www.humblebundle.com/

sale's finished at the moment

i have most of them, add me on steam if you want any (of course NOT FOR FREE)
BTW HERE YOU CAN BUY IT

Google is your friend.

They were limited time offers. If you want to know when the next one is available, follow them on twitter or subscribe to their newsletter. humblebundle.com.

cmon, it supposed to be a secret...

As said, you can buy them on http://www.humblebundle.com/ as long as they are on sale. You can pay what you want, and they allways record the average price. If you pay more than the average, you will get some extra games. Often they are previous HIBs, which you cant buy anymore.

They are on sale for a limited amount of time. If you follow them or sign up for their newsletter, or even just follow these forums, you'll know when the next one starts!

You know, the real curious george actually tried to answer his own questions