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You can buy student cards and charge them from one of the main stations like ATTABA, ABBASIYA, ROUD EL FARAG, SADAT. That’s if you’re a student in Egyptian universities or International universities in Egypt and for pupils as well.
For other people, you can get the card from any station for 10 E£ and charge it with up to 100 E£, It’s valid for 5 years.