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Where are Sci-fi book shops in Perth,WA? - second hand card shops

I'm looking for some sci-fi books that are out of print (the original Star Trek: Voyager Books). I'd rather buy in person, then for them online because I have a credit card. Does anyone know a good second-hand stores or from local book fairs are on the rise. I tried searching the stores used books and Isabel will not arrange for help.