Deep Discount has a Sudoku Keychain here for $1.99 shipped.
This might make a nice stocking stuffer or gift for a Sudoku lover who travels. I actually really like Sudoku and wish I had one of these on my 2 hour train ride years ago! :)
Deep Discount is currently running a promotion for BOGO on select Nickelodeon DVDs here. Some are as low as $6.32, with FREE shipping. Make sure you use code B1G1NICK0904 at checkout.
These might make great birthday gifts for upcoming parties.