Please note, this *isn't* the cheapest available but it is released earlier.
Cool shop are selling it for £23.99 but their stated release date isn't until the 04/06/09. The Hut has a release date of 22/05/09 whilst play has it as 29/05/09.
For those that want the cheapest, here's the link http://www.coolshop.co.uk/catalog/product/58437-boom-blox-bash-party--for-wii
The US version is out now and it's got great reviews, if you liked the first Boom Blox they've apparently improved everything (including the dodgy controls!).
* More Than 400 New Blox-Busting Levels: All-new explosive puzzle action builds upon your Boom Blox favourites while delivering tons of levels to explore, conquer and remix!
* The Ultimate Party Experience: More multiplayer action than ever before! Play crazy new levels with or against friends in cooperative, competitive and the all-new team-based action!
* Spectacular New Worlds: Beautiful themed worlds take you from mysterious planets to pirate coves and beyond! Battle giant squids or bash alien spaceships as you explore these stunning new environments.
* New Blox! New Shapes! New Tools! From Cylinders and Paint Blox to the Virus Ball and the Slingshot, you won't believe all the new ways to create chaos!
* Wacky New Characters: Now the all-new cast of characters are part of the destruction! Throw, grab and launch characters for fun, or use them as part of your strategy!
* New Rewards System: Collect Boom Bux throughout the game as you complete levels, then spend them unlocking new levels and features you can't wait to play!
* Content Available Online: Connect your Wii to the Internet and download new levels quickly and easily. Design your own levels with the expanded Create Mode and share them with friends or submit them to be shared with the world!
Don't forget Quidco tooooo!