I have seen price on basic styling material like Moonstone, Bone and Flint (the basic racial styles, blue motifs) skyrocketing during event. In guildstores people are sellin 1 moonstone for 50 gold. Just so everyone knows, the clothier, woodworker or blacksmith standing next to craft stations sell them for 15 gold per piece.
On the other hand, the more rare style materials are cheaper now.