Costco Sale – Snapware Plastic Food Keeper Set by Rhonda August 4, 2016 August 4, 2016 *UPDATE* 12/26/16. Storage galore. Costco has the Snapware 38-Piece Plastic Food Keeper Set on sale for $19.99 (after manufacturer’s instant rebate), now through January 29, 2017. That is $5 off… 0 FacebookTwitterPinterestEmail