At exactly 10PM Pacific tonight (11/26), I received the above email stating that the first flash sale (the Badass Lip Set) was now live on the UD site. So it APPEARS that each flash sale will go live at around 10PM Pacific each night (if you missed the list of deals for the next few days, CLICK HERE to view my Black Friday Round-Up).
I received this email at 10PM Pacific and promptly clicked the link at 10PM Pacific, but I was already getting the dreaded 404 Error. So I'm wondering if this set was available PRIOR to the email going out to subscribers? I have no idea, but comments on the UD Facebook page are indicating that this lipstick set sold out within 10 minutes of going live, whenever it actually did go live (I have no idea whether or not that's true, but as of the time of this post I'm still getting the error message...it's now 10:30PM Pacific).
If you try to snag any of these deals within the next few days, I suggest you log on prior to 10PM Pacific and refresh until the sale appears. Hopefully you have a better chance that way.
May the (makeup) Force be with you!