Years ago it was 50c or $1 per card and they processed it in a few days into your account, then they got swamped. I have not adapted yet to the changes so I have just been putting up with the $2 and now $3 fees since some ebay sellers didn't send to AUS so I figured it was just a cost of getting it in the US, save some there in the COMC inventory and then send back a bulk lot. Even the postage costs from COMC to us have increased drastically though.
So, see above where I posted the fee structure? it looks like now if you do one card it will be $3 or $3.90 because you can't say you have one card incoming to them, that's how I read it. Whereas say if you bought cards off a USA seller OR sent cards of your own to sell on COMC you would have to chose what service you want (how fast you want them processed into your inventory).
5 cards (any year) on premium service would be processed in 3 days once received and cost $6.
Current year cards would have to be 10 cards on the 1 week service and cost $6.
BUT - If you knew you had 5 cards coming from a US seller you would have to go through the SUBMIT ITEMS process in your dashboard so when they arrived from the seller you would not get charged the "missing paperwork" rate of $3+ ea.
Point being, figure out your preferred method and do it right, otherwise fees will kill you. Hope that is somewhat clear, it's hard to explain!