Ulta has B2G1 on Butter London polish. This always goes quickly; by the end of the day they’ll be down to one or two colors.
Speaking of Butter, go straight to the source for $10 pricing on a limited selection of polishes (don’t we wish they were all $10!). Free shipping with code CYBER12!
Nordstrom has some very cool gift sets (alas, no polish).
Bobbi Brown is offering free shipping on any order.
Teavana (yes, this is totally off topic but I love them) is giving away a free tin, a free sample, and giving free shipping on any order. Now’s the time to try a new tea.
I will update throughout the day as more deals come in.