Correction
???? That HAS to be a mistake...I will check it out....Flat Rate Priority Mail Envelope (only way I will send..Regular USPS Priority is much more) is $9.95...so there is something wrong for sure....I dont make money on shipping as a rule. There is a minor S&H fee.
I checked every listing up there...and there is nothing showing $18.50 for a Flat Rate Envelope shipment...only card looked at was Shack...that had to have been you.
I have never had a USPS Priority Flat Rate Envelope go missing...!st Class Int'l too many times missing...that is why Priority only.
The way to make it more economical is to buy more than 1 card..rate stays the same. Thats the way it is. If that is not for you...sorry about that but I will not send any other way.