You might want to look at once.com by 37signals. Although they do a lot of Saas products they must believe there is a market for buy once. They are also leading

You might want to look at once.com by 37signals. Although they do a lot of Saas products they must believe there is a market for buy once. They are also leading the way by ditching the cloud (https://www.datacenterdynamics.com/en/news/37signals-expects-to-save-7m-over-five-years-after-moving-off-of-the-cloud/ https://www.datacenterdynamics.com/en/news/37signals-expects...)