Everything Christmas related is now reduced up to 50% - Christmas Trees, Greetings, Poofers (particles) and many many more items.
You can find these items in-world at:
Knucklehead's
http://slurl.com/secondlife/Dingo/180/47/56
Be sure to look in the Christmas Shoppe and That Special Occasion while you're here for more Christmas items.
There are also many items available on SLX at:
http://xstreetsl.com/modules.php?CategoryID=142&SearchCurrentCategory=on&name=Marketplace&MerchantID=84349&