Interactive Brokers ETF Purchase Fee

Dear BrokerChooser,

I’m a bit confused about how much it actually costs to buy ETFs on Interactive Brokers. Between all the pricing tiers and potential extra fees, I’m not sure what I’ll end up paying. Can you please explain how it works? What is the minimum fee of buying 1 ETF? I would like to buy European ETFs, domiciled in Ireland and Luxemburg.

Thanks,
T