The term 'Source of Sticker Shock' can be summarized by two crossword solutions: 'THORN' (5 letters) and 'Pricetag' (8 letters). A THORN is a sharp, pointed object that is typically found on plants, such as roses. It is often used as a metaphor for something that causes pain or difficulty. A pricetag is a label that indicates the cost of an item. It is often associated with sticker shock, which is the feeling of surprise and dismay when one sees the price of an item.