Can I buy Final Cut Pro or do I have to subscribe to it?

It’s a single payment application, not a subscription. There is only one price in the App Store. It’s $299 in the US App Store. The price varies in different countries based on currency conversion.

1. It's a one-time purchase.

2. Unless you qualify for the Pro Apps Bundle for Education or get it preloaded with a Mac, it can only be gotten through the Mac App Store, and there's only one price for any given country.

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If you want to try it out before purchasing you can download a 90 day free trial from here.

https://www.apple.com/final-cut-pro/trial/

No payment cards are required to download it.

You will not be charged anything after the free 90 day trial expires so there is no need to cancel anything, just drag it to the trash when it is finished with.

It expires 90 days after you launch it for the first time.

Both the free trial and the purchased versions require macOS 11.5.1 or later. System requirements can be obtained from the above link.