If you cannot find a free copy, these options are the most affordable:
An excellent single-volume free PDF that uses the same "Early Transcendentals" approach as Stewart, covering functions, limits, derivatives, integrals, sequences and series, and vector calculus. It is considered "one of the best for coverage of the basics of calculus" by OER reviewers, though at 320 pages, it is more concise than Stewart's 1400 pages. If you cannot find a free copy, these
The 9th edition maintains James Stewart’s trademark clarity while introducing updates refined by co-authors Daniel Clegg and Saleem Watson. Both were mentored by Stewart, ensuring his distinct voice and instructional style remain intact. 1. Enhanced Conceptual Focus sequences and series