according to the ebay news, you can use the ebay postage labels with calculated postage as well now:

"Earlier this year, we announced the introduction of integrated postage label printing on eBay. Today we�re pleased to announce that all sellers now have access to both the flat rate Australia Post labels and the new, calculated Australia Post postage labels.

The flat rate labels can be used in conjunction with selected Australia Post flat rate satchels and boxes while the calculated labels let you create and print postage labels specific to your package or parcel.

Not only can you click, print and post, you can also pay through eBay. The cost of your postage is simply added to your monthly invoice so all you need to do is pop your item, with label attached, into any Australia Post box or store.

Learn more about Australia Post postage label printing on eBay."