Cyber Monday used to be the day for online sales but most started last Thursday or Friday however I admit that I was too busy with family to pay much attention.
Ancestry’s sales will finish at midnight EST tomorrow, the end of Cyber Monday and they include 20% off AncestryDNA ($79). 11/28-12/1
Family Tree DNA has sales and mystery gifts until the end of December, see Roberta Estes’ post for more details: http://dna-explained.com/2014/11/25/family-tree-dna-holiday-sale-including-mystery-rewards-starts-now/
and Family Tree Magazine has all kinds of holiday sales, with an additional discount that is ending Cyber Monday: http://www.shopfamilytree.com/cyber-monday-deals