Amazon is now taking pre-orders for OS X 10.6 (Snow Leopard), which Apple is going to release next month. The upgrade price for a single license is $29, and they’re offering a 5-pack family bundle for $49. They’re also offering a 5-pack bundle for the Mac Box Set. This is perhaps the most under-appreciated deal in Mac software. For $229 you get five licenses each for Snow Leopard, iLife ‘09 (iPhoto, iWeb, iDVD, iMovie, and Garage Band), and iWork ‘09 (Pages, Keynote, and Numbers).
I don’t yet know what Apple’s academic pricing will be for Snow Leopard or for the bundles. In the past they generally provide a 9-10% discount on OS X and iApps. So it may pay to wait. However, if you’re not entitled to an education discount, by all means feel free to order Snow Leopard from the MLS Store at Amazon.com.