For students only, Microsoft Store offers downloads of Windows 8.1 Pro for $69.99. (You must be running Windows 7 to qualify. Windows 8 users can upgrade via the Windows Store.) Plus, you'll receive a $25 off $50 coupon good for a future Microsoft Store purchase. (The coupon will display in cart.) Assuming you use the credit, that's tied with our mention from last week and $47 under the best price we could find for a download elsewhere. It features a new start-up screen; built-in SkyDrive; and more tile sizes, colors, & backgrounds.