When I returned my black GST w/silver hardware a few weeks ago, my SA asked if I was sure about returning it because they were no longer making black w/silver hardware. I didn't ask about the other colors.
This thread is really interesting. My SA always told me gold and silver hardware GSTs were classics. The Ala Moana Chanel boutique just happens to be sold out of the GST's with silver hardware because they're popular, not because they're limited edition.
I was looking for a s/h GST too. I went to Chanel at Holt in Vancouver about 2 weeks ago to ask for it. My SA said that it's seasonal and they're sold out now (there's not even one black GST with s/h in available in Canada. urgh!) She said that they might get some in next year. I really hope the price wouldn't shoot up again.