I bet you were none too happy to find that.
You might try
Jaycar Electronics . Use the category search on "Plugs & Sockets," sub-category "Computers." I can only see single USB sockets listed on their website, but you never know, they might have duplexes.
According to their Australian website, they have a store in Christchurh:
CHRISTCHURCH
409 Colombo Street
Cnr Wordsworth St
Ph. (03) 379 1662 Fax. 03 379 1663
Mon - Fri: 8:30 - 5:30, Sat: 9:00 - 5:30, Sun: 10:00 - 4:00
-- NZ -- South Island, New Zealand
Failing that, Mouser Electronics (Mansfield, Texas) carry a wide range, and overseas postage shouldn't be too much on small, light items:
Mouser, Search on USB Connectors [This message has been edited by pauluk (edited 09-11-2003).]