Definition of TAC
For new readers, TAC stands for Total Acquisition Cost. In most cases it would mean sales price + shipping & handling cost. This is the true cost to acquire a card (or anything else bought on auction). I think that this is important to include, especially since sellers charge such varying amounts for s&h. I've seen it range from Free to $15 for one card, although most charge between $2 to $5 (for USPS First Class Mail in a padded envelope).
Thanks for reading!