Aug 22, 2021 · COSTCO ITEM NUMBER & PRICING. The New 2021 Squishmallows Celestina, Naomi, Brittany and Pania are Costco Item Number 953258 and cost $9.99 in-store. These Squishmallows are not currently available online at, however we’d expect to see them there soon. There are a number of other Squishmallows available online at Costco including .... "/>