A pricing page with no prices (mixpanel.com)

that's hilarious.

"If you have to ask how much it costs, you can't afford it." –J. P. Morgan

we're a/b testing the button copy... the Starter package is free and the Growth package pops up a plan builder with pricing.

It's complicated because the price is based on your user volume so there's not a single price to show. We've heard this feedback though and are working on an improvement!