First Aid for the USMLE Step 1, 2010 in paperback for $23 + free shipping via 2-day

Amazon.com offers First Aid for the USMLE Step 1, 2010 in paperback for $22.50. Plus, this item qualifies for a free 3-month trial of Amazon Prime, which includes free shipping via 2-day delivery. (Select this option at checkout; you can cancel before the trial period is up.) That's the lowest total price we could find by $18, outside of the price below. This editon features 1,000 high-yield facts based on student reporting from the 2009 exam, hundreds of clinical images, and student ratings of top review books. Note that this title won't be in stock until January 5.

Of note, Walmart has it for $22.49 with free Site-to-Store. However, Walmart charges sales tax in more locations.