I'm not sure that this isn't going to become a CftFW but I figured if I take one of you fine folk with me then I can feel a little bit better...
Anyway, I have purchased via eBay what the seller (Le Tour Sports/Giro Australia/KB Trading) in Melbourne claims to be a workshop box of 25 x KMC X10.83 chains (assuming no quick links) for $50 and $10 postage.
eBay says there's three items left...
Compatible with all 10 speed drive train systems. - Pin length: 5.88mm. Specially designed outer plate to enable fast, smooth and precise shifts. full australian. 100% australian. - Including MissingLink 10 (CL559).
www.ebay.com.au