MiBand, Xiaomi's new wristband only costs £7.50 (only available in China).
Hands on with Xiaomi’s $13 fitness band- Might have to try one of these out
Pulsera Inteligente Sumergible MiBand
Bradychan® Replacement Band Wrsitband for Xiaomi Mi Band MiBand Bracelet Fitness Wearable Tracker No Tracker (orange)
The Xiaomi Mi Band to rule them all