The Game Collection is a UK online game retailer highly praised for being quick with dispatches and pre-order prices, also worth noting, they only add new games for pre-order when they've got a confirmed date/cover/stock otherwise it's a no go.
So yeah, quite a surprise that Nintendo's decided to stick to Rainbow Curse than Rainbow Paintbrush, honestly Rainbow Curse is better as it fits with Canvas Curse and it's more popular.
As for the price, it's £26.95 which in dollars translates to $41.53 so it's pretty close to the original $40 budget price.
By the way, it's a shame this is a GamePad-game because all the beautiful visuals will be on the HDTV while the game's on the GamePad. Nintendo could've made it compatible with the Wiimote. *sigh*