there are a few online stores based in australia that sell imports but their prices are generally quite high. as for actual stores in sydney, try chinatown. but don't be suprised if you buy fakes... ebay really is the best go. or if you don't mind using western union or credit card, go for
www.zest.co.th
they're legit. the money you pay for shipping and money transfer will be made up by the cheap prices. don't know if they'll have what you're after though.