How much do 30 second ads cost?

Could you please elaborate on the cost of 30-second advertisements? Are these prices standardized across different platforms or do they vary based on factors such as target audience, time of day, and popularity of the platform? Additionally, are there any additional fees or costs associated with producing and airing these ads that potential advertisers should be aware of? It would be greatly appreciated if you could provide a general range or an example of how much a 30-second advertisement might cost on a popular platform, as well as any tips for budgeting and planning for this type of marketing expenditure.