The link is a little bit buried right now as I work to get more photos into the store and the last of the promised fundraiser features up. I suspect it'll become much more prominent in the weeks to come. :)
One reliable place to find the link that Sanne gave is under "Billing," hit the button "Get more photos"
I promise to make that more intuitive ASAP! :) Also keep checking back, we have lots and lots of bundles in the works of widely varying sizes.