Red, I've posted my red charms to you today!
Here is a strange event-- I stopped at the post office to pick up flat rate envelopes, and they didn't have a priority bubble envelope. I didn't have one at home either, so I used an ordinary manila bubble envelope. It was a used one that I had from receiving something from somewhere. When I got back to the post office, I asked if I could send it the same as the flat rate priority bubble envelope, and the postman said, "Sure!" So, maybe if your post office doesn't have what you need, you just ask, and they will help you out! :-)