Back for the second week in a row is the Costco Weekly Insider Deals. This weeks Costco deals run from September 15th through September 21st. Besides the coupons, there’s also mention of returning items and new items in stores. The Costco September 2025 Coupon Book is also running this week through September 21st. Then, starting September 22nd is the upcoming Costco October 2025 Coupon Book, so make sure to check that one out too! If you want to get notified as soon as we release the upcoming Costco Black Friday 2025 Ad then make sure to sign up for our email list, follow us on Instagram and Like us on Facebook!

There’s some interesting items in the September 15th Costco coupons. The one that we’re most excited for is the new Kirkland Signature Variety Dessert Bars! Initial reviews are very positive and we can’t wait to give them a try. That being said, we’ve also heard great reviews on the Mocha Crunch Bar Cake, which is also new. Did you know you can also follow us on Instagram to see the new items that show up in Costco stores?

Which items in this Weekly Insider Deals stand out to you? Anything you’ll be picking up? Leave a comment and let us know!

Here’s a few of the deals in the Costco September 15th 2025 Weekly Insider Deals:

• Kirkland Signature Fresh Farmed Steelhead Fillet $5 off
• Kirkland Signature USDA Choice Beef for Stew $7.99/ lb
• Kirkland Signature Chicken Alfredo with Penne Pasta $4.49/ lb
• Returning Item – Sweet Kale Salad Kit
• PopCorners Popped Corn Snacks $3.20 off
• Snack Factory Organic Original Pretzel Crisps $2.50 off
• Organic Apples Galas $1 off
• New Item – Mocha Crunch Bar Cake $18.99
• New Item – Kirkland Signature Variety Dessert Bars $19.99
• New Item – Kirkland Signature Chicken Jerky Dog Treat $4 off
• and more…