Where can I buy a DC12V 8A Power Adapter?

I have a surveillance system, and the power adapter went bad.
The system has no model number, no brand, nothing. All I know is that it is one of those round 4 pin connectors and its DC12V 8A . I was able to find the right one online, but it’s only 5 amps, I need at least 8.
It has to be 12 V

See if these will suffice.

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