DEAL STACK - KollyKolla Stainless Steel Vacuum Insulated Water Bottle
I have found this Amazon deal stack.
For Color Macaron Blue, Cool Gray (750 ml) Price is £10.08
For Color Barbie Pink+yellow (750 ml) Price is £9.95
For Color Blue (650 ml) Price is £8.58
It is reduced in an Amazon lightning deal plus there's a coupon you can combine on top.
This is the lowest ever price on Amazon.