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Newegg [newegg.com] has Microsoft Windows 7 Home Premium OEM SP1 (64-Bit) for $ 99.99.

Use promo code: EMCASNT224 to save $ 30, $ 99.99 – $ 30 = $ 69.99. Shipping is $ 2.99.

Valid through 11:59pm PST 5/28/15.

You can also get a free upgrade to Windows 10: info [microsoft.com]