Costco is hiking its membership fees from this weekend - with some shoppers threatening to "cancel" their subscription. The wholesale warehouse chain - which has 29 shops and two million customers in the UK - has sent letters to shoppers to let them know about the changes, which will come into force from March. Costco sells items in bulk but you need to be a member to be able to shop there. Commenting on one deals group a member said: "Going to cancel. Wait for a big tech deal to come along