Where can I find a replacement power supply for my computer?

I need to replace the power supply in my computer [an HP Pavilion Slimline Desktop Model#S3560f] I don't what would be compatible. I believe the current one is 60Ws? LINK: http://h10025.www1.hp.com/ewfrf/wc/document?docname=c01564827&tmp_task=prodinfoCategory&cc=us&dlc=en&lang=en&lc=en&product show more I need to replace the power supply in my computer [an HP Pavilion Slimline Desktop Model#S3560f]
I don't what would be compatible. I believe the current one is 60Ws?

LINK: http://h10025.www1.hp.com/ewfrf/wc/document?docname=c01564827&tmp_task=prodinfoCategory&cc=us&dlc=en&lang=en&lc=en&product
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