Best Buy via eBay offers the Misfit Flash Activity Tracker 2-Pack in Onyx/Wave or Reef/Fuschia, model no. S175, for $24.99. Opt for in-store pickup to avoid the $3.99 shipping fee. That's the lowest price we could find for this quantity by $15. It tracks activity, calories burned, distance traveled, steps taken, sleep quality, and hours slept; it wirelessly syncs to iOS and Android mobile devices via the Misfit app.