When I talk about Oracle cloud with customers its quite common for them to have a perception that it's going to be expensive.
However when we look a the cost of a system it's often the case that we come in less expensive than our competition. One of the tools I use is the cost estimator which can be found here:
It recently had some changes which allow you to save, export and import calculations so that you do not have to start everytime a fresh.
Take a look, and I'd like to hear what you think about the cost and also the estimation tool.