Weber parts can be had from above-mentioned aircooled.net, Redline-Weber, and Carbs Unlimited.
I recently found out that webercarbsdirect.com in Long Island NY owns the Weber name, but has almost everything manufactured in China now.
Not bad for jets I guess, but I like GOOD parts so I'll get them from one of the other vendors.
Recently I ordered a Dell main jet from aircooled.net and it came quickly and the shipping was cheaper than advertised on the web. Thanks John Connolly!