Of course HDDs are gonna be a lot cheaper, but how much space do you really need? I have a 512GB SD card in mine and that seems to be plenty right now. All that extra space is not worth anything if it's not gonna be used for anything worthwhile anyway. I think it's worth paying $50 more for the convenience. And by the time you need more space, bigger cards will have gone down in price a lot. But I guess that's subjective.