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Instruments & Supplies (New, Used & Rental Textbooks › Reference, Books): Amazon KDP category data
Amazon Books Best Sellers data for Instruments & Supplies (New, Used & Rental Textbooks › Reference, Books), updated Nov 2, 2026: median price $38.28, median 14 reviews, average rating 4.5 and a KDPTop opportunity score of 24/100 (highly competitive).
| Price range (middle 50%) | $27.52 – $85.24 |
|---|---|
| Average rating | 4.5 |
| New releases (90 days) | 8% |
| Books on the list | 100 |
| Store | Books |
What stands out
- Its median reviews are 15% of the parent category Reference (92), one of the easier corners under it.
- At $38.28 its median price beats 93% of Books categories, leaving more margin per copy.
- Its review barrier is lower than in 79% of Books categories: the median best seller has only 14 reviews, so new books can chart with few.
Top 10 Instruments & Supplies best sellers
-
Learn Medical Spanish For Healthcare Professionals: 7 Books in 1: Speak Medical Spanish in 30 Days!
- List rank#1
- Price$27.70
- Rating4.5
- Reviews282
-
Top 400+ Drugs Decoded: The Ultimate Pharmacology Coloring Book & Study Guide to Visualize Complex Drugs, Strengthen Long-Term Memory, and Reinforce Learning with Unlimited Practice Tests
by Rowan Peay
- List rank#2
- Price$28.97
- Rating4.6
- Reviews137
-
NHA Phlebotomy Study Guide: The Complete and Up-to-Date Prep Book to Pass the NHA CPT® Exam | Exam-Style Questions and Full-Length Practice Tests—For Students Who Don’t Have Time to Waste
by Clinical Bridge Exam Prep
- List rank#3
- Price$29.90
- Rating4.9
- Reviews49
-
NLN NEX Study Guide: Your Updated NLN Outline Companion for Smarter Studying, Higher Confidence, and Strong Verbal, Math & Science Foundations
by Preparix
- List rank#4
- Price$35.99
- Rating4.8
- Reviews193
-
Introduction to Medical Equipment Repair: A Practical Handbook for Biomedical Technicians
by Frank Weithöner
- List rank#5
- Price$38.66
- Rating4.6
- Reviews26
-
USMLE Step 1 Made Easy: Your High-Yield Blueprint With Step-by-Step Guidance to Tackle Step 1 With Confidence
by NS Publications
- List rank#6
- Price$39.65
- Rating4.7
- Reviews257
-
Sterile Processing Technician Workbook & Coloring Book: Interactive Medical Illustrations, Knowledge Checks, Case Scenarios, and Exam Review
by Randy W. Hall
- List rank#7
- Price$14.99
- Rating5.0
- Reviews5
-
NEXT GENERATION NCLEX-RN® PREP: The stress-free, all-in-one NCLEX-RN® guide: 6+hrs audiobook, 10 full-length exams, 1,000 new CAT questions, memory ... and mindset tips to become an RN fast!
by Sophia Clarke
- List rank#8
- Price$34.97
- Rating4.4
- Reviews164
-
Sterile Processing: A Comprehensive Guide: For Classroom and Certification Exam Preparation
by Michael Luciano
- List rank#9
- Price$9.99
- Rating3.8
- Reviews46
-
The Cath Lab Tech Protocols Bible: Cath Lab Technologist Orientation Manual and RCIS Study Guide: Step-by-Step Procedures, Table Setup, Hemodynamics, Radiographic Views and 200 Practice Questions
by Vania Snee
- List rank#10
- Price$36.99
- Rating4.6
- Reviews31
FAQ
Is Instruments & Supplies a good niche for Amazon KDP?
Its KDPTop opportunity score is 24/100, which makes it highly competitive. The median best seller has 14 reviews and sells for $38.28.
How many reviews do you need to rank in Instruments & Supplies?
The median best seller has 14 reviews, and 86% of them have fewer than 100.
What do Instruments & Supplies best sellers cost?
The median price is $38.28; half of the best sellers are priced between $27.52 and $85.24.
Can new books break into Instruments & Supplies?
8% of the current best sellers were released in the last 90 days.
About this data
Data comes from KDPTop's daily crawl of Amazon's public Best Sellers pages; medians use the latest list. The opportunity score (0–100, higher is easier to enter) combines the review barrier, the share of low-review books, list turnover, new-release share and price.