I didn't ask to send it registered. I gave the guy the padded mailer that only had 2 cards on it. He weighed it. It was 85 grams. Then he said its 12 express or 9.30 normal. Told me I would have to use a normal envelope for it to be cheaper?It’s more expensive because you sent it registered with a tracking number.
If you sent a letter like you described without a tracking number (no security) it would only cost you roughly $3.30 after the bag and stamps.