Data teams spend a lot of time measuring and optimizing the effectiveness of other teams. Unfortunately, we're not so great at doing this for ourselves. In this talk, we will dive into a big blind spot that a lot of data teams operate with–not knowing how much they're costing their business (now and in the future). Given how easy it is to rack up expensive bills in pay-as-you-go tools across the modern data stack, this can become a big problem for data teams, very fast. We'll discuss how to build cost monitoring capabilities (and why you should make this a priority), some of the challenges you will face along the way, and suggest ways to implement cost containment best practices into your workflows to drive cost accountability across your data team and company.