Kakashi is from the 7-day login. You can get Iruka from either spending a certain amount of money or get lucky from the Seal treasure (I believe it's a total of 6000 ingots to be able to get him plus other things) and Zabuza is from the Seal Treasure.

To throw a comparison, it's $100 for 5000 ingots, so little over 100 ac*ulated.