Originally $9.99. Great little cartoon shooting party game, particularly for the kids. Closest thing to Point Blank I've seen on the PS3 (although sadly still very far from this classic original).
Really good with the Move controllers, that people have forgotten about (unless you have a PS4). Requires a little effort to get this price. See first post for sign up details.
$0.99 only applies if you already have a US PSN account set up with credit in it. If you don't currently you will need to to buy $10 credit initially (£8.85 at present). Of course you will still have $9.01 left to spend on other items.