I chose "Other." For the past few years my primary method of discovering new ebooks has been here at Mobilereads. Once I see a book mentioned in the Bargain or Recommendation threads I check it out.
At this point, another survey option comes into play -- if the book is free I'm much more likely to download it. If I like it I'm very likely to buy more by that author if the other books are reasonably priced. If the first book in a series is free and the others are up to $2.99 I'm likely to buy. If the others are 3.99 to 4.99, I have to really like the first one. If they're more than 4.99 each I'm very unlikely to buy them.
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