POST office customers in Sheffield are being urged to check their drawers and purses for unused savings stamps as they can only be used to buy services until Monday February 28.
Savings stamps, which are used to pay for bills over the counter, are being phased out after the new Post Office Budget Card was introduced.
The Post Office estimates there are £75,000 worth of savings stamps still to be redeemed by customers in Sheffield.
It is encouraging customers to use the stamps to pay their bills, transfer the money onto a Post Office Budget Card, or bring stamps into branches to receive a full refund.
After February 28 customers will be able to bring their savings stamps into any Post Office branch and apply for a cash refund.
Savers have been told they will not lose their credit.