Gday mate im not sure what there wear rate is of a SD card but i recon moisture would be a biggy. but i am looking as well what price and where have you found the best price.
One thing that might help that i read was DO NOT TRY TO COPY THE CARD IT WILL XXXXXXX IT WELL AND TRULY .I read an article about a guy that did this the small print on the packet warns do not copy.
Cheers Rob