While I cannot link to or endorse piracy, students often use "LibGen" for out-of-print textbooks. Proceed at your own risk. The 3rd edition is technically out of print, but still under copyright.
Revisiting a Classic: Harris Benson’s University Physics If you’ve spent any time in a first-year engineering or science program, you’ve likely heard of Harris Benson’s University Physics University Physics Harris Benson 3rd Edition Pdf
If you absolutely cannot find the Benson PDF, or if the scan quality is terrible, here are comparable (and free) alternatives. While I cannot link to or endorse piracy,