Sandy, I absolutely agree ! I would hope that if there is postage due from a trader they would kindly PM me. I feel that in many cases, I overpay so that this doesn't happen.
Since mailing isn't controlled like eBay or Sportslots does, you are on your own... slap on a stamp...pay Priority postage...trek to the PO and deal with a clerk... or pay through PayPal, my favorite to use with TCDB especially on "weighty" items, shipments to Canada or any other international order.
Teresa, sorry that has happened to you and once again, Sandy said it "I am sure that 99% of us on here will make up the difference to you either in refunding you or sending out more cards. This site is all about collectors, not people trying to scam others".
Thanks, ~Bob~