Costco Sale: Tristar Power Pressure Cooker XL 8-Qt $74.99 by Rhonda July 16, 2020 *UPDATE* 1/23/18. This pressure cooker traps superheated steam and locks in intense flavor and nutrients. Costco has the Tristar PPC-8 Power Pressure Cooker XL 8-Quart on sale for $74.99 (after… 0 FacebookTwitterPinterestEmail