Jon,
Here's a listing in Australia:
Products | Hardiman
I'd buy a set of 50 idle jets, a set of100 holders and a number drill set (61-80) or preferably a metric set (.3 - 1.5) and drill you own combo.
When you find the right size from experiment, you can then buy the "right" jets.
And another link that maybe of interest to you:
JayCee enterprises - Â Â Â Â Â Webers by JayCee