Like Djohn says, Insight used to sell an Educational Upgrade version of Windows XP Pro, but they no longer have it shown. It's where I bought mine and, surprisingly, there weren't any checks for eligibility.
I have bought xp pro oem full version (not academic or upgrade)with disk and license in sealed packs for £95 and I still have 2. They came from a retailer but were bought with machines. I bought 12 for a network but only used 10 as we kept w2000 on 2 machines.
I could be persuaded to sell one! with "a piece of hardware to justify the oem license"
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