How much does Sia storage cost?

Can you provide a detailed breakdown of the costs associated with Sia storage? Are there any upfront fees or ongoing charges that users should be aware of? How does the pricing model of Sia compare to other cloud storage solutions in terms of affordability and scalability? Is there a way to estimate the cost of storing a specific amount of data on Sia's decentralized network? Lastly, are there any discounts or promotions available for new users or those who store large amounts of data?