Fitbit's Flex wristband goes on sale: harder to lose, easier to track - Gigaom
Fitbit Flex for sale | eBay
Biareview.com - Fitbit Charge 3
Fitbit unveils $100 'swim-proof' Flex 2 and $150 Charge 2 with heart rate monitoring | VentureBeat
Amazon.com: Fitbit Inspire 2 Health & Fitness Tracker with a Free 1-Year Fitbit Premium Trial, 24/7 Heart Rate, Black/Black, One Size (S & L Bands Included) : Sports & Outdoors