Over the last few years banks have started offering postage stamp withdrawals from ATM's. Not only are these convenient, but they are often available 24/7 and they charge your bank card automatically. The only problem is that not all banks sell stamps and the ones that do don't guarantee the sales of stamps in every branch or ATM. You can often download your banks app which allows you to search for ATM's that have the option to sell stamps.
The Following banks sometimes sell stamps enter your postcode or city below, hit enter and find your closest banks.