Princeton Tec Scout LED Headlamp (Blue) for $9.93.  Select free ship to-store for in-store pickup at REI.  Otherwise shipping is $5.99 making the total $15.92 shipped or shipping is free for REI members on orders over $75.00.  Here is a screenshot for your reference.  It features waterproof construction, an adjustable headband and it runs on 4 CR2032 coin-cell batteries that are included.  Most places have it for about $13.