Found 1st Jan 2016
Fitbit alta (in black or teal) have been reduced at sainsburys, down to £80. However, Sainsburys love to give vouchers out at the till or after an online shop, and these vouchers can be used on the fitbit! I had a "£10 off a £50 online grocery shop" that worked. Delivery is as little as £1 or you can click and collect for free!