What does this really mean this toy costs an arm and a leg?

The phrase "costs an arm and a leg" is an idiomatic expression that means something is very expensive. When someone uses this phrase to describe a toy, they are emphasizing that the price is unreasonably high or beyond what they consider acceptable. It conveys a sense of frustration or disbelief about the cost. Overall, it's a colorful way to express the idea of significant financial sacrifice for a purchase.