How much does big data sell for?

I'm curious to understand, what kind of value does big data hold in the market today? How much can one expect to sell or purchase such information for? Is there a standard pricing structure or does it vary significantly based on the type and quality of the data? I'm interested in knowing the factors that influence the pricing of big data, and whether there are any trends or projections for how the value of big data may change in the future.