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I buy a single book if it looks interesting and I want to read it, along with a good price. If it’s a series and I want to purchase the entire set, I’d do that. Sometimes I can get a series as cheap as an individual book, so if I’ve enjoyed the books, I’ll buy the series in ebook format and sell my print copies. It all depends if I rally like them and want to keep a series.
Linda
Lindacritcher[at]gmail[dot]com