Sorry, but I think it's depressing that so often when a company or organisation makes a kind offer to one group, people from others consider themselves 'excluded' and complain. Ultimately that will make it more difficult to offer help to anyone.
I don't know if the supermarket offers a delivery service, but even if it does, deliveries are loss leaders, and require different forms of stock control from in-store shopping. You are not being prevented from reaping the benefits - you have as much right to take advantage as anyone else. It's just that your circumstances mean that you are unable to do so, which is not the fault of the store.
Sorry, but you did ask.
