I only just posted an update and already there’s more news: Sudoku Xtra is now available on Amazon.com

That was pretty quick, and is great news!  I already have my proof copy from them, and it looks just fantastic – lovely glossy colour cover, and fantastic quality printing within.  It’s essentially a  large size magazine printed at top book quality, and the paper it’s on is perfect for either pencil or pen solving.  It’s much better quality than a regular store puzzle magazine (particularly US ones, which are typically on very cheap and thin paper).