How much does it cost to cross the CBX?

I'm curious to know, how much does it typically cost to cross the CBX? Is there a standard fee that applies to all travelers, or does it vary depending on factors such as the type of vehicle, the time of day, or the specific route being taken? I'm interested in planning a trip and want to ensure I have a good understanding of the associated expenses. Additionally, are there any discounts or promotions available that could help reduce the cost of crossing the CBX? Please provide as much detail as possible to help me make an informed decision.