um, not that I know of. if you have bought the Windows 8 upgrade when Windows 8 first came out, you could have gotten it for $40 from Amazon like I did. Most online stores are selling the Windows 8 upgrade for around $80. This is the cheapest I have seen it online.
i7-4770k, ASRock Z87 Extreme6, Radeon 6870, 16 GB G.Skill Ripjaws X DDR3-1600 , OCZ ModXStream Pro 700w, Samsung 830 Series 128 Gb SSD, Windows 8 Pro, WEI Score 7.7(video card)