The Wizard is now undead. Yes, she's that Heather Wood. If you go to the first link (click on her name), you can see what she's been up to.

They usually keep most TP books in stock at my local bookstore. Let me know if you get desperate, and I'll see if I can provide you with a copy. Amazon would be faster. I was going to provide a link to Terry Pratchett at amazon.co.uk, but their design doesn't allow for it. Type "Pratchett" into the search box at the top, and you ought to get to the right information.