Re: This is Insane
That's about what a good 64GB card still costs. You can get oats that have been through the horse for a lot less than fresh oats, but I wouldn't trust my data to a cheap card. Samsung and SanDisk make the chips, everyone else (except maybe Microdia) buys the chips from them and makes the cards. (There's more than just storage in an SD card - it's a little computer.) I trust that the manufacturers use the best chips for their own cards (doing anything else would be stupid).
But remember, we used to pay $80 for a 256MB card. Prices come down as sizes go up. Try even finding a new SanDisk 4GB card these days - they're not worth enough to sell. In a few years Amazon will have 512GB cards on sale for $25, and we'll be reading an article about a $1,000 2TB card.
(I'm a software junkie, and even I have a problem filling up a 64GB card. 512GB? The article is right. If you want to shoot raw high-definition pictures for 8 hours without having to change the card, that might be the right card for you. [Just getting that one great shot because you didn't have to swap cards would more than pay for it.] But in my phone? Oh, right, I want to install every app on the Play Store, so I can mirror the Play Store on my phone. Come on, that's at least a few hundred feature length movies. Enough for a round-the-world trip without watching the same movie twice. I can carry a few 128GB cards in my pocket for a lot less money.)