A reasonable IT quotation is not only about the total price. It should make the scope, assumptions, exclusions, licences, integrations, data work, implementation effort, support, responsibilities and acceptance clear enough to understand what you are buying. Compare the business outcome and total arrangement, not just day rates or a single software price.
Ask what is not included
Interfaces, migration cleaning, training, reporting, travel, environments, support and future changes can materially alter the real cost.
Check who owns the difficult work
If the quotation says “client to provide data” or “integration by third party,” find out exactly what that means and who coordinates it.
Compare like with like
Two prices can differ because one proposal includes transition and support while the other leaves them outside scope.
How soapplied approaches the question
I would not start by assuming the stated problem is the whole problem. The first step is to understand the people, purpose, constraints and interactions around it, then test what intervention would improve the system rather than merely optimise one component.