Several of Slitherine's iOS wargames are currently on sale.....Drive on Moscow, Battle of the Bulge, Vietnam '65, Panzer Corps are on the list.  Some up to 75% off.  Link here:  http://www.slitherine.com/news/2107/The.iOS.Holiday.Sale.part.one!

Apparently there will be a "part 2" to this sale soon!