For the items who needs additional charges. The discount is applicable to this item.

E.g. a coat needs additional $4, you just need to add 4 of item to your cart before check out.

Note:
1. Make sure you select the right product "xxx need additional $4" before pay. Otherwise, it would be confused why you pay $4 more.
2. This item is free of shipping and only used to make up the right price for purchasing some special items (will be marked in the description of these items)