Mounjaro Cost at Costco in 2026: Real Pricing Breakdown

Without insurance, Mounjaro at Costco costs roughly $1,040 to $1,100 a month for a 28-day supply of four pens in 2026, among the lower cash prices at major pharmacies. Costco and Sam’s Club tend to run a bit below CVS, Walgreens, and Rite Aid, with Walmart in between. Lilly’s 2026 list price is $1,112.16, flat across all doses, so the warehouse discount is real but modest. If you have type 2 diabetes and commercial coverage, a savings card can bring you to as low as $25. Here’s the full picture, and where tirzepatide gets cheaper.

What Mounjaro costs at Costco

Costco’s pharmacy operates near break-even as a way to keep members happy, which translates into consistently low cash prices. Mounjaro’s price is the same at every dose.

How Costco compares to other pharmacies

Across major retailers in 2026, the cash-price ranking for Mounjaro roughly runs from the warehouse clubs at the low end up through the chain drugstores. Costco and Sam’s Club usually sit lowest, often within $10 to $30 of each other. Walmart lands slightly higher, with CVS, Walgreens, and Rite Aid higher still. Independent pharmacies vary widely. If you’re paying cash and have a warehouse membership, that’s typically your best brick-and-mortar price.

GoodRx at Costco

Costco accepts GoodRx coupons, but for Mounjaro the coupon price is usually about the same as Costco’s standard cash price. Lilly’s contracts limit how much third-party discount cards can cut brand-name GLP-1 pricing, so don’t count on a coupon to drop the cost meaningfully below the warehouse rate. It’s still worth a quick price check at the counter.

Membership programs, HSA, and FSA

Some Costco members without insurance can use the Costco Member Prescription Program for additional savings on certain drugs. HSA and FSA funds cover Mounjaro at Costco when you have a qualifying diagnosis, and the pharmacy’s receipts are formatted for reimbursement. Using pre-tax dollars effectively lowers the cost by your tax bracket.

A note on LillyDirect

Lilly’s lower-priced self-pay vials ($299 to $449 a month) are for Zepbound, not Mounjaro. Mounjaro isn’t yet available through LillyDirect’s self-pay program, though Lilly announced in late 2025 that it plans to add it at a discount; the pricing hasn’t gone live for patients. For now, if you want tirzepatide for weight loss and are paying cash, Zepbound vials or a cash-pay telehealth program are usually the more affordable tirzepatide routes.

Lower-cost tirzepatide options

Mounjaro’s track record in type 2 diabetes is strong. In the SURPASS-1 trial, tirzepatide as a standalone therapy produced significant reductions in blood sugar, establishing the foundation for its later use. But the retail price is steep for anyone paying out of pocket. Consider a scenario where someone with diabetes has a high-deductible plan and faces the full cash price until they hit their deductible. Comparing Costco’s price against a savings card, and asking their provider about timing fills, could save real money. TrimRx offers physician-prescribed tirzepatide through a cash-pay telehealth program, priced from $179 to $1,579 a month depending on the medication and your situation.

For more on your options, our guide to the Mounjaro cash price breaks down every channel, and will insurance cover Mounjaro for prediabetes covers the coverage angle. If you’d rather compare coupon pricing on tirzepatide generally, see our tirzepatide cost on GoodRx breakdown, and check your eligibility through the free quiz.

This article is for educational purposes only and is not medical advice. Drug prices and pharmacy discounts change frequently, and 2026 figures may shift; verify current costs with Costco, your plan, and the manufacturer. Always consult a licensed healthcare provider about treatment decisions.