CRM implementation cost depends on three factors: scope of custom development, number of system integrations, and complexity of data migration. At Selleris, Bitrix24 implementations start at $5,000, with most projects landing between $8,000 and $25,000. HubSpot implementations start at $12,000 for focused Sales Hub or Marketing Hub deployments and reach $60,000+ for multi-hub RevOps projects. Microsoft Dynamics 365 implementations start at $25,000 for standard rollouts and reach $150,000+ for enterprise deployments with Azure integrations and ERP connectivity. Every project receives a detailed fixed-price estimate after the discovery phase — no hourly surprises, no scope creep billed mid-project.