Today only, Damusy via Amazon offers the Damusy Fitness Tracker in several colors (Black pictured) for $25.99. Coupon code "3FDHJYWA" cuts it to $15.59. With free shipping, that's $10 off and the lowest price we could find. It tracks steps, distance, calories, and sleep. This version doesn't include a heart rate monitor.

Update: Black and Pink are both $20.99 before coupon, $12.59 after.