I use the cypress bark, and was also paranoid about having mites, so when I ordered mine I put it in a deep freezer for 3 days. It took a while to thaw, then dry out, so I would make sure you have enough to last until the new stuff is ready. (I didn't have a deep freezer, but my boss did and was fine with storing it, just in case you also don't have one)
EDIT: I didn't see all the other posts