Amazon.com: AK Replacement Bands Compatible with Fitbit Alta Bands/Fitbit Alta HR Bands (10 Pack), Replacement Bands for Fitbit Alta/Alta HR (10 pcs-a, Small) : Electronics
For Fitbit Charge 2 Bands Replacement Sport Strap Accessories with Fasteners and Metal Clasps for Fitbit Charge 2 Wristband (Small, LemonYellow) - Walmart.com
Fitbit Flex review: A most versatile, feature-packed tracker - CNET