: $10 – $30. Be cautious of battery life, as these older devices may only hold a charge for 4–5 days.
: $29 – $60. These are "new old stock" found on sites like Mercari or eBay . cheapest place to buy fitbit one
is out of warranty and no longer supported by Fitbit, purchase from sellers on eBay who offer free returns to protect yourself against defective hardware. : $10 – $30