EDD, The Itrader is a mutual thing between seller and buyer. If the transaction is satisfactory all around. Both buyer and seller should receive from each other. I've notice in the review thread that you have received Itrader numbers, but your customers haven't. When this system is followed properly its helps both parties, as other members will see that you are honest and fulfill your part of the transaction, whether you are the seller or buyer.
I can. Additional cost would be $3 to cover postage. I'm new to Paypal, so the price would default to $18. However, overall cost would need to be $21 USD, if you know how to post that additional money into the account. Otherwise, you can forward a money order or certified check.