How often does Cyperous restock or get new styles?

I have one of Cyperous' large curly hime wigs and wanted to get one in black but they are out of stock of the only black one listed in their shop. How often does cyperous restock or get new styles? I was going to get some other wigs too but if they're going to be coming out with new styles or restocking in the next month I'll wait and order everything at once. Thank you!