I posted a JBR earlier this month and someone asked about where the tupperware shop is in Bali. Its located just past the big roundabout as you head into Denpasar on the right hand side. The address is Jl Teuku Umar No. 65 A Denpasar and the contact number is 0361 8433161 and email wmb@indo.net.au. The shop is very small, however if they do have in stock what you require they will order for you.
We have found the quality to be exactly the same as the tupperware purchased in Australia for a fraction of the price. As a test, my mum purchased 'fridgesmart containers' and has had a piece of broccoli in this container since the start of September and its still crisp, green and as good as the day she purchased it (not that I would eat it haha).
Any further questions, please feel free to ask.