Tor (US) have a publisher sale on
24 ebooks for $2.99 each (One day only: today 29 November.)
Some excellent titles, some of them were on sale at this price earlier this year, but there are also some I haven't seen discounted before.
Edit: I just realized it is 30 November where I am, but the special prices are still up, so maybe we have 'til Monday.)
Edit2: Another one at $2.99 until 2 January:
Stepping Stone / Love machine, by Walter Mosley