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I have the bundle book from LSAC for PTs 52-61, but since that one only cost me $20, I'm really not trying to spend $50 on the individuals 62-68. Am I just not searching for it correctly on Amazon, or is it not out yet?

It's not out. For the past several years, LSAC has only done bundles of 10 exams. 62-68 isn't enough exams for them to do a bundle yet.