If I were to limit myself to "US$99 or less", I wouldn't get many books from Amazon, since they're US$11,99 including the "international whispernet punishment".
Ayway, since my personal record in high price is ~US$3.000,- for a book (Ok, an Encyclopaedia), and also have several reference book series (history, science) in excess of US$500,- I set no actual limit.
If I want a book and can afford it, I buy it.
So far the most expensive (and wanted) eBook has been US$16,49 off Amazon.
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