Clinical Microbiology Made Ridiculously Simple is one of the most popular microbiology review books for the USMLE. That has been confirmed in our Best Microbiology Book For USMLE Step 1
Poll in which it has got most of the votes.
Few days ago, the new fifth edition has been released. The new edition has slightly more pages than the previous fourth edition and it's stuffed with even more humorous graphics, mnemonics, and updated high yield topics.
The new edition is available from Amazon
for little over $30 and it has rendered the price for the previous editions lower.