At one of my hosting facilities outside Seattle I'm paying $2k per month for 25 terrabytes of transfer which is industry average. That's roughly 7.8 cents per GB. I'm billed using 95th percentile billing as is everyone running at scale. We're small compared to many larger consumer web startups. As you increase in scale, prices drop dramatically e.g. triple our transfer would give roughly half the price.
I know you're probably referring to options for small startups just starting out, but thought I'd share that data.