If you're unable to find a free PDF version of the book, you can consider the following options:
Go to AbeBooks , eBay , or Amazon Marketplace . You can often find the international edition (softcover) of the 3rd edition for $10–$20 USD . The international edition contains the exact same problems and text. University Physics Harris Benson 3rd Edition Pdf
The book focuses on central issues and highlights as few equations as possible to keep the student focused on fundamental principles. If you're unable to find a free PDF
If you truly cannot afford Benson, the free University Physics (Volume 1-3) from OpenStax is an excellent modern alternative, though it lacks Benson’s unique problem style. University Physics Harris Benson 3rd Edition Pdf
Good luck with your physics studies—may your vectors always add up.