Get the Amazon app store everyday they have a free paid app. Many times they are crap but sometimes they have a good one like today it's Peggle.
Yeah. You get some good freebies on the Amazon Appstore. I acquired Plants vs Zombies via the Amazon Appstore for free by temporarily borrowing a US friend's Amazon account.
If you've ever played PvZ on the desktop then the mobile version seems to be pretty much identical in features. Only thing I can't find at the moment is the puzzles but that may be unlocked later.