There are not any Friends of the Library book sales scheduled right now. The next one will most likely be in October. If you check back in September we should be able to tell you a date. In the meantime, the Thrift Shelf in the front of the Library does get updated regularly and is available whenever the Library is open.
I'm not sure, the easiest way to find out would to be to call the library and ask, I've found that's the quickest way to get an answer, or you could search for the library on Google and do the message thing
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