well I live in Korea so there's no shipping fee, so it's a lot less expensive lol. For example when I bought 10 D.O. albums it wasn't even $60, plus I have a job too which helps. I just give all the albums away to my students to try and convert them into EXO-Ls so I don't even have to worry about storage (although I keep one for myself and I keep the photocards haha).
Of course you should keep the cards lol. Charity only goes so far! :D That's awesome that your there and able to do that. I hope that one day being there will allow you to see them live (if you haven't already) :)