Hi Warehouse, are you thinking of prepaid envelopes that you can maybe purchase from Australia Post Store? If so, they do have a store on here, or you can go to the Postage Centre and have alook in there and see if they are available for purchase on line (I don't know, you will have to have a look for your self)
You find the postage centre up the top right of your screen. There is a tab up ther called "Sell", hover over that and you will get a drop down menu with one of the options being for Postage centre - follow enough links and from memory you end up connected to where you can buy products.
Otherwise, as basil said, this is just a general discussion board with members just lkike you. We are not eBay staff etc or specific eBay stores, so if you have a seller in mind, in their listing or details they will have a "Contact Me" or "Ask Seller A Question" option, and you can ask them directly.
Hoping this helps a bit.
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