Best Buy already launched the Cyber Monday Sale today on Sunday making Cyber Monday a two day sale event.
You do not have to wait until you are at the office on Monday, you can shop the Best Buy Cyber Monday deals today. I assume other retailers will follow that example. Keep an eye for the Cyber Monday Deal announcements that should appear later today and early tomorrow morning.

The Best Buy Cyber Monday deals include:
Mitsubishi - 60" 1080p DLP HDTV for only $999.99 (Compare Prices)
Archos - 705 WiFi Portable Multimedia Player with 160GB HDD for $349.99 (Compare Prices)
Sony BRAVIA KDL-46W4100 46" 1080p 120Hz Flat-Panel LCD HDTV for $1,399.99 (Compare Prices)

Find many more Cyber Monday deals and promotions now on Best Buy.
More Cyber Monday 2008 Deals.