Yes, Microsoft Copilot, formerly known as Bing Chat, is available for free.
The cost of the application-specific Microsoft Copilots depends on the service it is being integrated into.
For example, Copilot for Microsoft 365 has been made available for enterprise customers at a whopping $30 per user per month.
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For context, the price of the add-on is more than the lower-end plans of Microsoft 365 business subscriptions, which range from $12 to $23 per user per month, and almost the same as Microsoft's Office 365 E5 highest-end enterprise subscription, which costs $38 per month.
However, Copilot in Windows was rolled out for free via a Windows 11 update.
Other applications like Copilot for Sales and Copilot for Service have a lower cost of $50 per user.
GitHub Copilot for an individual costs $10 per month or $100 per year, and $19 per user per month for businesses.