you can find them on ebay, I saw them last week while looking for a new LCD.
linky
it depends on what you mean by "main" one. is it the cable connecting the two halves of the phone? It is also attached to the ear piece speaker, volume control, and power button, IIRC (just had the phone apart, but had a few drinks tonight...)
here's the one for the lcd half.
and if you can't wait 2-3 weeks from HK,
here's one in Oklahoma, though at almost twice the price.