In 2016, ULA released the Cislunar 1000 Vision with an aim of creating an economy on the Moon and in Earth orbit with 1,000 people living and working in space. Core to this aim was that the production of fuel in space would allow for dramatically cheaper space travel. ULA made clear it was willing to become a customer for in-space refueling. It previously announced a willingness to pay US$3,000 per kilogram for fuel delivered in low Earth orbit, US$500 per kilogram on the lunar surface, and US$1,000 per kilogram at L1. ULA believes it will need off-Earth propellant supplies sometime in the 2020s. In December 2016, ULA created an online pricing tool called "Rocket Builder", which allowed potential customers and the public to estimate launch costs of the Atlas V rocket with configurable orbits, payloads and launch services. Purchase-price estimates were removed from the tool in 2018 because it potentially provided commercially sensitive information to ULA's competitors. Despite ULA's cost-cutting and restructuring, the cheapest ULA space launch in early 2018 remained the Atlas V 401 at a price of approximately US$109 million.