Do not look only at final price
A cheap but vague proposal can become expensive through changes, delays and misunderstandings.
Questions to ask
What is the first release? What is out of scope? Who prepares data and access? How are tests, security, support and changes managed?
The value of a roadmap
For SMEs it is often better to build in steps, starting from the module that solves the main problem.
CONSOO proposal
CONSOO turns the process into architecture, features and phases before development starts.