CO
Best Protein Deals at Costco
Warehouse club with bulk-pack exclusives and consistently low per-unit prices on RTDs. Membership ($65/yr) required. Free shipping on $75+.
18 cheapest here
11.4% avg savings
78 best value score
Free shipping $75+
Products Cheapest at Costco
18 productsPremier Protein 30g Protein Sh
Premier Protein
30g Protein Shake (15-Pack)
15-pack · Chocolate
Protein DrinkSave $4.00
Check retailer for current price 10% OFF $36.99$40.99
Premier Protein 30g Protein Sh
Premier Protein
30g Protein Shake (15-Pack)
15-pack · Vanilla
Protein DrinkSave $4.00
Check retailer for current price 10% OFF $36.99$40.99
Premier Protein 30g Protein Sh
Premier Protein
30g Protein Shake (12-Pack)
12-pack · Strawberries & Cream Shake
Protein DrinkSave $3.50
Check retailer for current price 10% OFF $30.49$33.99
Fairlife Core Power
Core Power Elite 42g Protein Shake (12-Pack)
12-pack · Strawberry Banana
Protein Drink
Check retailer for current price $42.99
Now Sports
Whey Protein Concentrate
5 lb · Creamy Vanilla
Whey ConcentrateSave $4.00
Check retailer for current price 11% OFF $31.99$35.99
Fairlife Core Power Core Power
Fairlife Core Power
Core Power Elite 42g Protein Shake (12-Pack)
12-pack · Cookies & Cream
Protein DrinkSave $4.00
Check retailer for current price 9% OFF $42.99$46.99
Fairlife Core Power Core Power
Fairlife Core Power
Core Power Elite 42g Protein Shake (12-Pack)
12-pack · Cake Batter
Protein DrinkSave $4.00
Check retailer for current price 8% OFF $43.49$47.49
Fairlife Core Power
Core Power 26g Protein Shake (12-Pack)
12-pack · Chocolate
Protein Drink
Check retailer for current price $34.99
Fairlife Core Power Core Power
Fairlife Core Power
Core Power Iced Coffee Protein Shake (12-Pack)
12-pack · Original Iced Coffee
Protein DrinkSave $4.00
Check retailer for current price 10% OFF $34.99$38.99
Fairlife Core Power
Core Power 26g Protein Shake (12-Pack)
12-pack · Chocolate Peanut Butter
Protein DrinkSave $4.00
Check retailer for current price 10% OFF $35.99$39.99
Fairlife Core Power
Core Power 26g Protein Shake (12-Pack)
12-pack · Banana
Protein DrinkSave $4.00
Check retailer for current price 10% OFF $35.99$39.99
Fairlife Core Power Core Power
Fairlife Core Power
Core Power Iced Coffee Protein Shake (12-Pack)
12-pack · Mocha Iced Coffee
Protein DrinkSave $4.00
Check retailer for current price 10% OFF $34.99$38.99
Sports Research
Whey Protein Isolate
2 lb · Vanilla Bean
Whey Isolate (WPI)Save $4.96
Check retailer for current price 12% OFF $36.99$41.95
Isopure
Zero Carb Whey Isolate
7.5 lb · Creamy Vanilla
Whey Isolate (WPI)Save $15.00
Check retailer for current price 14% OFF $89.99$104.99
Isopure Zero Carb Whey Isolate
Isopure
Zero Carb Whey Isolate
7.5 lb · Dutch Chocolate
Whey Isolate (WPI)Save $15.00
Check retailer for current price 14% OFF $89.99$104.99
KOS
Organic Plant Protein
2.6 lb · Chocolate
Plant ProteinSave $13.00
Check retailer for current price 25% OFF $39.99$52.99
Vital Proteins
Collagen Peptides
1.25 lb · Unflavored
Collagen ProteinSave $7.00
Check retailer for current price 15% OFF $39.99$46.99
Vital Proteins
Collagen Peptides (Family Size)
2.5 lb · Unflavored
Collagen ProteinSave $9.00
Check retailer for current price 12% OFF $64.99$73.99
About Costco Protein Prices
Does Costco have the cheapest protein per unit?
Often yes on bulk RTD cases (Premier Protein, Fairlife). Costco sells exclusive large multipacks that work out cheaper per serving than anywhere else.
Do I need a Costco membership?
Yes — a Costco membership costs $65/year. If you buy protein regularly, the savings on bulk RTD packs typically pay for the membership within a few orders.
Does ProteinPrice earn from Costco?
No — we do not have an affiliate relationship with Costco. We track it because it often has the lowest per-unit prices on RTD multipacks.
Compare with other retailers
How we use Costco prices
We do not have an affiliate relationship with Costco. We track their prices because they are a meaningful US benchmark. Read our full methodology.