: While Amazon prioritizes the latest editions, you can click on "See all formats and editions" to find used listings for the 2017 version from third-party sellers.

: This is one of the most reliable sources for older editions of textbooks. They host listings from thousands of independent sellers worldwide.

: A great option for finding medical texts at a significant discount, though inventory for specific years can fluctuate.

If you are preparing for the current USMLE Step 1 exam, it is highly recommended to use the most recent edition (e.g., 2024 or 2025) to ensure you have the updated "Step 1 prep" facts, as medical guidelines and exam formats change annually.