Best Protein Bars at Costco
Protein bars available at Costco in bulk — best prices per bar.
Quick Answer
Costco offers the best bulk pricing on protein bars — often 30-50% cheaper than grocery stores. Kirkland Signature bars are the standout value at ~$0.85/bar with 21g protein.
Our #1 pick at Costco: RXBAR Chocolate Sea Salt — 12g protein, $1.70/bar.
We tested and ranked every protein bar available at Costco. Rankings are based on nutrition, taste, and value — not store placement or brand deals. Last updated: August 21, 2026.
Top 3 at Costco
Best bars you can buy at Costco right now
RXBAR
Chocolate Sea Salt
Balanced daily macro source with clean ingredients and solid taste.
Cal
200
Protein
12g
Sugar
14g
Larabar
Peanut Butter Chocolate Chip
Clean plant-based recipe ideal for a vegan lifestyle.
Cal
220
Protein
5g
Sugar
16g
Ready to try RXBAR Chocolate Sea Salt?
Based on real testing of 108 bars
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Costco Shopping Tips
How to get the best deals
Kirkland Signature bars are Costco's best-kept secret — $0.85/bar with 21g protein
Buy boxes of 20-24 for the best per-bar price
Check the seasonal aisle for limited-edition flavors
Costco.com sometimes has different stock than in-store
Compare unit prices — some "deals" are actually more expensive per bar
Shop Other Stores
Compare availability across retailers