Cheapest I can find it. I've tried quite a few of these shakers and the Sistema one seems to be the best quality for the price. Perfect for anyone using SlimFast etc to shift those Christmas lbs like me! Currently £3.75 at Tescohttp://www.tesco.com/groceries/product/details/?id=283897841
Cheapest it's been on Amazon was £4.99
Sistema Shaker To Go, 700ml.
The Sistema Shaker To Go is the perfect solution for making your shakes on the move! When shaken, its grooved base helps to agitate powder mix drinks, while the spiral spider not only breaks up the powder but also aerates the liquid. It has an inserted grip for secure handling and an internal thread so that the base can be comfortably used as a drinking cup. The flip-top sipper also features a rubberised seal to avoid leaks.
Freezer safe. Microwave safe without lid. Dishwasher safe - top rack only. Always read the label before use. Assorted colours.