These codes are given out with special promotional cards and marketing campaigns. But you're welcome to share them--many fan sites keep track of them and I'm sure some of your fellow Cahills can tell you more.
Here's one of my favorites: HOPECAHILL
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Admin Gavin B
Author of Josh Baxter Levels Up.
- "Smartly paced and emotionally engaging, a book even those who have never held a controller will enjoy." - Kirkus Reviews, starred review