Costco price 87g per 100g
Tesco, Poundstretcher and Iceland price on offer and the lowest price of the year is £1.06 per 100g
This makes the lowest price offer from the supermarkets and high street discount stores is still 22% more costly than Costco. Add to this 3% for American Express Executive membership of Costco it turns out 25% more costly at supermarkets.
Note that the Best Before is July 2018, which I am hoping is enough for 60 cubes per household.
Seems like even the stock cubes at Costco are larger 6.3g @Costco while 5.9g per cube at supermarkets.
Competitive pricing from mysupermarkets for 24 cubes:
Tesco £2.20 any 2 for £3.00
£1.55 / £1.06 / 100g Valid until 03/01/2017
£2.20 any 2 for £3.00 Offer