Dear Amazon, sometimes you suck.  There must be a way for you to detect products sold by vendors at astonishingly low prices because if it happens, it's probably because there's a scam.  Take for example this 256GB memory card selling at $9 while the one right beside it sells at $117.25.  It's in fact a 4GB card with a hacked firmware.  It's useless and it will corrupt/destroy your files.

Heading to BestBuy because Amazon, I will never buy memory cards from you.