[mawalu]

Hetzner Cloud(!) only has 20TB/Month included in the monthly costs and states that you have to pay for any additional traffic. I never reached that on one of their cloud boxes so I don't know how it looks like but it definitely isn't all up front. But yes the dedicated machines come with no additional traffic charges whatsoever

[CodesInChaos]

Additional traffic costs 1 EUR/TB (plus VAT, depending on where you live). So it's about 50 times cheaper than the big clouds.