Put your hand in the box and see what you get, you cant pull the item out and try to look thru the flavors.  A lot of what is in the box is 3mg and there is a couple 0mg.  The prices of what you pick are dictated by the size: 15ml is $3; 30ml is $4 and 60ml is $5.  Keep in mind the bottles are going quick.  There is no knowing what is in the box ;)