15th anniversary sale from Bohemia in Steam. Few highlights --

• A3 free weekend
• Arma: Cold War Assault free
• DayZ 15% off ($25.49)
• A2 & A2 OA 80% off ($2.59 & $3.99)
• A2 Army of the Czech Republic, British Armed Forces & Private Military Company 80% off ($1.79/each)
• Arma Tactics 80% off ($1.79)

Check it out - maybe nice if you wanted to fill in some DLCs, checkout some older games or try out DayZ Mod.