These days: None. I've gotten too particular about what I read to automatically buy any author's material sight-unseen. I have a number of authors that I look for, of whom I love some of their books, but couldn't care less about the others.
My transition from paper to electronic has encouraged this change in habits, as I discover new authors and more varied story lines. I shop by story type and writing quality now, as opposed to shopping by author.
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