To me GSI is the BEST second hand industry. I shop mainly at the Gosnells store but there are also many more GSI's around the suburbs. Although the goods are second hand they are sorted out (you get the best), all electrical goods are tested (that's a bonus!) and they are placed in very neat sections. They sell almost anything you want, from baby clothes to furniture (depending on the size of the store), for example, art and craft, sewing, wool, DVD's, books, magazines, bric a brac, curtains, linen, toys, electrical goods, clothing for all the family and much, much more. If you can't find it just ask the friendly staff and they will be happy to help. All you will need to do is give your purchase a wash and there you go, it's as good as new - and you have SAVED heaps of dollars. That's what makes GSI stores a GEM.
The prices are very reasonable but you can get even better bargains as they have a half price day once every month (now, that's a gem).