How much is Helium Mobile per month?

Excuse me, could you please clarify the pricing structure for Helium Mobile? Specifically, I'm interested in knowing how much the monthly subscription costs. Are there any additional fees or charges that I should be aware of? Additionally, does the pricing vary depending on the plan or the amount of data usage? I'd appreciate any information you can provide to help me make an informed decision. Thank you in advance for your assistance.