I think the last batch I bought were Sandisk 32GB Ultras. I bought a 5 pack. At about $6 a pop, that's like the cheapest reel of tape you could ever buy. Use it one time, dump it to the computer and file it away in an envelope for archival purposes.
I gave up on trying to dump SD cards to hard drives so they could be reused, unless its just me screwing around with testing stuff or working on a song.