Website cost depends on the number of unique templates, content requirements, integrations, commerce features, localisation and the level of strategy involved. Comparing quotes only by page count hides most of the work that affects results.
A small brochure site can be straightforward. A lead-generation website requires research, positioning, conversion paths, measurement and search architecture. A platform with accounts, payments or complex workflows is a software product and should be scoped accordingly.
Ask every provider what is included, who owns the source, how changes are handled, what performance standards apply and how success will be measured after launch.
What to do next
Choose the one improvement most likely to reduce friction for a valuable user journey. Measure the result, learn from it and build from there.