Disappointed on how this set was marketed and priced! Bought this product because i thought I was saving money by buying a set of 4 bottles. The product sells for $44 for four 5ml bottles (20ml total). But when you buy the 4 products in 10ml bottles (40ml total) individually, you only pay $66. So shouldn't the whole set just cost $33 only because you only get half of the total volume? Does the box cost $11? It didnt help that the customer service agent didn't mention the differences in volume between buying individually or the set.