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You can search for members that have joined box o'books and have books by the author that you are looking for on their shelves. Sometimes the bookshelf headers have deals, or if you are a boxer too, maybe they would want to swap with you :)
When I was reading the Stephanie Plum series, I posted in this forum a list of what I was looking for. People were more than happy to help out! I quickly had them all, and sent them out to people who did the same. That might work for you.