http://www.amazon.com/gp/product/B0091XHZW8/
Cheapest I've seen the regular digital download version of the game go for, as of yet. Not the digital deluxe version, but definitely a great way to get into it for cheap :D
EDIT: Woops.. apparently the amazon download thread included this already...
Don't go for this one, guys. It's definitely a fake, no wii branding, as many have mentioned before. Plus, I found this on the site http://dl.dropbox.com/u/760027/random/fake.png . Mentions manufacturer is some random company called Sakar.