If you are only able to add two of an item to your cart, that means there are only two of that shade available. 

IF LESS THAN 3 ITEMS are available, you can MIX AND MATCH with other sale items for the BUY 1 GET 2 FREE sale. CLICK ON "SEE ALL ELIGIBLE ITEMS AND TERMS" at the top of the listing by the B1G2 promotion banner to view additional items that are included in the sale.