Is the n scale white christmas set bac24016 or the locomotive for that set still available?
I believe that set is out of production, at least it's not listed on the Bachmann store pages.
You may get lucky and find one new somewhere in someone's shop.
The loco in that set is a 0-6-0 still available but not in that livery.
http://www.modeltrainstuff.com/N-Scale-0-6-0-s-s/1737.htm
If you must have that loco in that livery, look to eBay.
Buyer beware.
Good luck
Check amazon here for a similar set:
http://www.amazon.com/Bachmann-Spirit-Christmas-Ready-Electric/dp/B0038LJS9C