The Costco Halloween decor 2026 September wave has arrived — and the member community's response to what is hitting warehouse floors right now communicates the specific commercial urgency that every experienced Halloween-decorating Costco member knows: the items generating excitement in the first two weeks of September are the items that are gone before October. Costco has a lot of Halloween finds this year — from Disney wreaths and clocks to a Hello Kitty jack-o-lantern — an