The cost of implementing Dynamics 365 varies widely based on several factors, including:

Modules and Features: The specific Dynamics 365 applications and features you choose to implement (e.g., Sales, Customer Service, Finance, Supply Chain Management).
Number of Users: The number of licenses you need for your team.
Customization Needs: The extent to which the solution needs to be customized to fit your business processes.
Data Migration: The complexity and volume of data to be migrated from existing systems.
Integration Requirements: The need to integrate Dynamics 365 with other systems and applications.
Training and Support: The level of training and ongoing support required for your team.
Deployment Model: Whether you choose a cloud-based, on-premises, or hybrid deployment.

On average, costs can range from a few thousand dollars for a small business with basic needs to several hundred thousand dollars for larger enterprises with extensive customization and integration requirements. For a more precise estimate, it's best to consult with a Microsoft Dynamics 365 partner who can assess your specific needs and provide a detailed quote.