Though it's a bit fuzzy. This article is about "Sierra." Department of Energy awarded $325 million to build two supercomputers, "Summit" and "Sierra" both at 150 petaflops each. IBM took $325M, so, it's $162.5M until someone corrects me.

However, the actual proposal it's under (CORAL) included more than that, approaching almost $2 billion in the RFP. They also added $100M for R&D. All these machine systems are considered NRE projects (non-recurring engineering) and contain more than just the hardware and each is estimated to be budgeted at about $400M per system (operational expenses, etc).