Unfortunately yes, I've had the same problem. I did exactly the same thing as you did, order the bonus disc on Ebay from a seller and then the freeloader from a gamestore.
Luckily i have both the American and European version, but my friend (who i reguraly play Link Arena battles with) only had the Euro version and had to get the US version on Ebay. Lot of trouble for us Europeans to get our hands on the bonusses...but i have to say it was worth it, the extra Con ring as well as the other stat ups help alot in making good Arena teams