So, I totally wanted a Happy Planner but I'm cheap so...
While at Hobby Lobby I found this MAMBI sticker storage book:
It is designed to hold a mess of stickers and has dividers and divider stickies that you can use to put sticker pages in your sticker book but costs at least $10.00 less than a regular MAMBI Happy Planner.
SCORE!
It's really pretty easy to make this into a planner, too! The inserts & pages have to be 9x6" instead of the typical 9.25x7" and I've found that I did need to swap out the large discs for medium, but now it's perfect (and only cost me around $18 for the whole thing- and it came with stickers!)
I TOTALLY recommend DIY-ing your planner- you'll be able to have exactly what you want and exactly what you'll actually use!