Acer via eBay offers its factory-refurbished Acer Liquid Leap Fitness Tracker in Royal Blue, Black, Purple, or Red for $19.99 with free shipping. That's tied with our mention from last week and the lowest total price we could find today by $9. It's compatible with Android, iOS, and Windows phones and tracks sleep, calories, steps, and distance, as well as smartphone notifications. A 90-day Acer warranty applies.