How much do turbos cost?

Could you elaborate on the pricing of turbos, specifically? I'm interested in understanding the range of costs associated with different types and models of turbos. Are there significant variations in pricing based on brand, performance, or installation requirements? Are there any hidden costs or additional fees that one should be aware of when considering purchasing a turbo? Additionally, is it generally more cost-effective to buy a new turbo or to opt for a used or refurbished model? Thank you for your insights into this matter.