Costco Deal: Snapware Glasslock 20-Piece Set $23.99 by Rhonda August 10, 2020 *UPDATE* 12/29/12. Costco has the Snapware Glasslock 20-Piece Storage Set on sale for $23.99 from January 7 – 20, 2013. That is $6 off Costco’s regular price of $29.99. Limit 5. This … 0 FacebookTwitterPinterestEmail