If you are looking for the full tracker unit, these retailers currently have listings:
: Offers new units for roughly $56.99. You can also find bundles that include the tracker, charger, and extra bands for around $59.99–$124.99. where to buy a fitbit flex 2
: You can find brand-new, factory-sealed units here for approximately $143.50. Fitbit Flex Accessories - Amazon.com If you are looking for the full tracker