If you truly cannot afford any CostX license, consider open-source or freemium estimating software:
For users who are willing to spend a little money, there are low-cost options available to obtain Intopc: costx getintopc free
The draft should be structured with an introduction, sections on free tools, how to use them, security, and a conclusion. It's important to emphasize legal and ethical use, respecting the terms of service of any services mentioned. If you truly cannot afford any CostX license,