A solutions manual is not a crutch here—it is often a lifeline. But a word of caution: Any "complete" manual you find online is likely student-generated, instructor-only material leaked, or contains errors.
For the classic textbook by David M. Kreps kreps a course in microeconomic theory solutions
While a single, authoritative PDF of every answer doesn't officially exist for public distribution, students generally find help through three avenues: A solutions manual is not a crutch here—it
Here are solutions to some key exercises from Kreps' book: instructor-only material leaked