How much is the toll fee for Skyway?

Excuse me, could you please clarify the toll fee for the Skyway? I'm planning a trip and would like to know the exact amount I need to budget for. Is it a flat rate or does it vary based on certain factors, such as the time of day or the type of vehicle? Additionally, are there any discounts or promotions currently available that could help reduce the cost? Thank you for your assistance in this matter.