Note - I place each card in a Soft Sleeve, and I often put 2 or 3 in one Semi-Ridged holder, because Top Loaders get bulky in a plain envelope. This works in most situations.
IF too many cards are purchased (around 8 or more) a normal
envelope can't work without endangering the cards, THEN the shipping fee
will be $4.00 for a padded mailer, I do not make any money off of this arrangement!