Today only, Pogo is offering 25% Off Undiscovered World Episodes. No promo code required, the sale prices are already marked down in game (15 Gems each for Club Pogo members and 23 Gems each for non-Club members).
This sale does not include the latest episodes of "The Mystery Down Under" - Chapters 5 through 8.
http://www.pogo.com/games/undiscovered-world
Before buying go look in your Badge Album under UNDISCOVERED WORLD to make sure you did not already get these for free when Pogo had a glitch and gave out both the badge for doing Samari's Gold AND Mystery Down Under Episodes. They are showing only up to episode 8 (not on sale) and while it shows episodes on sale to 4, I already have up to episode 10 badges and am not going to pay even the discounted rate just to change the episode page.