AKICIF: full student editions of Windows XP

I think I may need a full legal retail copy of Windows XP. Upgrades won't do, OEM copies won't do, previously authorised copies won't do, yadda yadda.

Luckily, I am a student! And MS has a student program! But it appears only to sell an upgrade of Windows XP Professional (for approximately diddly squit), not a standalone of either home or professional. Am I missing something?