The Transformer is already a pretty great deal in the world of Android tablets - you get the same 10.1" screen and dual core processor as its competitors, for the low price of just $399.99. But if that price point isn't enough to get you to rush out and buy one, or you'd like some extra cash for that keyboard dock, you're in luck - you can get it from Target for a cool $40 off by using the code TCA27BAR at checkout.
The only problem is, the tablet isn't exactly available - it's still on backorder, so Target warns that it will begin shipping "in 2 to 4 weeks." Of course, shipping will set you back another $7.95, and you'll still be paying taxes, so chances are you either won't be saving too much off the original $400 price, or you'll be paying more, whereas with Amazon you could forego both those additional costs. Unfortunately, Amazon doesn't have any in stock yet either (in fact, it's powered by Target as well), so the Target deal is probably the best one around at the moment.
Bonus: another 5% off by using the REDcard, if you've got one.