The way I did it is you go to this page:
http://www.alicescollections.com/one-do ... ?cPath=161And add the dollar item that it shows to your cart. This will basically just add $1 to your cart- nothing else. Then in the notes area of your order, indicate what item you were looking to use for that $ and link to the item, give item number etc. I also sent them an email explaining which dollar items I wanted after I placed my order and was sure t include my order number - just to be extra sure.
You can also get to this page by looking at the bottom of the menu on the left and clicking on the link that says
USD1.
Hope that helps!