The October 2026 book covers September 21 through October 18 — 28 days of Member-Only Savings that span the transition from the September back-to-school and household reset period into the October commercial calendar that the October guide documents: the Halloween Treats Sale (October 22-31), the Holiday Savings Book arrival (approximately October 19), and the beginning of Costco's holiday commercial season. The October 2026 coupon book's commercial character is specific and

Costco has quietly become one of the best-kept secrets in Halloween shopping. While home haunters obsess over Home Depot and Spirit, the warehouse club drops a rotating set of large animatronics at aggressive prices — and because stock is limited and the Costco model is built on limited quantities and rotating buys, the assortment changes without warning. If this year is anything like the ones before, the best items will sell out long before October 31. That warning — from Be