ALPS Mountaineering Foam Sleeping Mat for $7.93.  Select free ship to-store for in-store pickup at REI.  Otherwise shipping is $5.99, making the total $13.92 shipped, or, shipping is free for REI members on orders over $75.00.  Here is a screenshot for your reference.  It is designed for weight-conscious trekkers, climbers and backpackers to trim ounces from their pack's load, and features closed-cell foam for warmth with minimal weight, and rolls up for transport.