Looking for a good deal on ANY/All the professor layton games

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So my wife decided she likes professor layton, and with the final one released now, she wants to start at the beginning and of course follow the story line. So I am looking for the games for cheap...if anyone sees any anywhere for cheap, especialy Last Specter (4th game) let me know...I can find the others pretty well, but that one especially is high priced...the others are decent but still not what I would want to pay for all six...

 

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Okay so I have the original trilogy, but now I need to find the last specter for cheap. Most are running high in price. I can get the two 3ds ones for cheap easily so I am not so worried about those.

 

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Snagged the hardest one, the last Spector for $12. Woot!!! Now to get the 3ds ones and enjoy a puzzle marathon