If I wanted to get a German Knight set today. I would get the one House of Chess sells. For about $50 you couldn't find one much cheaper.
Lowly German Knight chessmen get an upgrade to first class.

Not sure he ships to Australia. He's based in Maryland (US). I would message him on eBay first just to be sure, and possibly get a shipping quote before going through the trouble of purchasing. The box was about 10x12x6 inches. About 3 pounds.
Username: goodknightmike here and on ebay. It doesn't look like he's too active here anymore. His eBay storefront is very active. He responded within a day.
Check your messages for a direct eBay link.
This German Knight set seems like the ones Chess Cafe use to sell when they use to sell sets. I bought one for about $20 in Rosewood / Boxwood with extra Queens back about 7 years ago. I gave the set away as a birthday gift.
https://www.chess.com/forum/view/chess-equipment/quotthe-good-the-bad-and-the-uglyquot-german-knight-set
Post #9 seems like the set original poster posted.