I'm using the 동아 (Dong-ah) textbooks for 3rd and 4th grade and wanted to post some of my materials in case they can be useful for anybody.
You can sign up on the Dong-ah website with your co teacher's help and access the e-book and other materials here: http://www.douclass.com/

Lesson 1: Hello, My Name is Cindy
New Words and Expressions PPT (from the Dong-ah website)
Fast Reading (I use this as a warm up before every class to drill vocab. There are 3 sections to the PPT: 1st, read aloud the English and Korean as it appears. 2nd, speak the Korean word while looking at the English word. 3rd, speak the English word while looking at the Korean word.)
Bingo (Listening Game)
Who's Behind? (Speaking Game)
Pass the Ball (Speaking Game)
Mission Impossible (Writing Game)
Frozen (Bomb Game)

All the PPTs have been taken and tweaked from other users on Waygook, so a big thank you to the original posters!