I asked Quark about why they didn’t begin selling QuarkXPress 9 through their online store when they released the final version of QuarkXPress 9 on April 6th. (This was the final, complete version, but stops working 30 days from its first use.)
It turns out that it takes a few weeks to get all the physical media together and into the retail channels. Quark wanted to protect retailers sales and so they wouldn’t sell QuarkXPress 9 before the resellers could ship the product.
Anyway, it’s all good as of today. Go forth and buy QuarkXPress 9 from your preferred source! Upgrades from version 7 or 8 cost $299. (If you’re using the free 30-day trial version, all your documents will be read perfectly by the retail version.)