I have a large spot in my heart for variety or junk shops. Everything is so random and so cheap!! Discount Bazaar in Bondi on Hall Street is that catch-all shop that will probably have what you need. Especially if what you need is a snorkel mask, Christmas card, boomerang, 3-pack of glue sticks, Jesus candle, pancake flipper, or lollies leftover from 1983.
Discount Bazaar is a great place to stop if you need gag gifts that are Australia related and you don't want to spend that much money on them. If you're going to a dress-up or theme party, they have leftover Halloween costumes (or maybe they're stocked all year 'round?), including your typical scary masks and coconut shell bikini top.
They also have water guns, which is a pretty major win. read more