According to the patch notes, the GK's are supposed to be 50% from 8-12 CST, which would be 9-1 EST. I haven't seen any of these reduced prices yet. The only time I've seen the price differnt was the very first day of the patch. At 5pm EST, the price of the port from Oren to Rune was 7,000a, normal price is 10,000a, so 7k is not 50%. The price has remained 10Ka for this port since then.