Memory cards i always buy in a local B&M store, or from Amazon UK or DE ( Denmark too small to have a Amazon store but i think we will be getting a data centre )
Maybe someone should drop recommended brands and models so Captain know what to look for if he go shopping.
At least you got some out of that memory card, i have tried 2 times and mind you with very expensive high end cards, well the one i dident get to fill just 1 time, the other dident make it to 2 cycles.
But it is what it is, and that's why it is so important to buy in a place where you stand a good chance of getting good service.
And mind you those two quick to die memory cards, well those are just a few of the many many memory cards i have or have used, so nothing alarming in that.