Past experience tells us that there will be another coupon along in a few months. Now it might be that something changes, and we never see a discounted ebook again. But that seems very unlikely.
It's probably best to proceed on the assumption that as good a coupon will become available sometime in the next year. In which case, ask yourself "Am I really going to read this within the next year?"
If the answer's "Probably not", then don't buy.
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