Boy this post got off track fast.
I did my 1st order using the PO box at sportlots.
4 sellers 17 cards Cost of shipping to PO box $1.15.
Cost shipping to me from PO box (unknown) They do it by weigth and do not know untill your cards are packaged. . I asked them and they figured about $5.00 By what I understand is they over pack so it is higher becuse of the weigth. When I have sent out cards (25 cards for $3.50) I will save approx $2.35 using the PO this time will have to watch each order.
If I did it my normal way I would have gotten 12 cards with $6.50 shipping cost. I would not have purchased the other 5 as their shipping was higher then the cards were worth.
With COMC I only ship when I get over 100 cards. It has taken me over 6 month one time.