Hello. I am looking to purchase a Macbook and, due to a limited budget and limited need, I had hoped to purchase a refurbished one. When I looking at the apple refurbished store the other day, there were many models of MacBooks ranging from $800 to $1100. Today, however, there are not any in the store. I can only assume that this is caused by Apple running out of stock. I am now wondering how often Apple restocks its refurbished products? Thanks in advance.