Senior citizens, could you please tell me how you keep down the cost of your main meal and have it include some meat or other protein?

Most days, if I'm feeling well enough, I have a home cooked meal (otherwise I have a microwave meal). I want to include fresh veg. and some form of protein (meat, fish or eggs). I try to keep the cost of that meal down to a maximum of £2. Do you think that this is ridiculously low?
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