Not sure if this is old news, but you can make your own Passbook cards if you go to Passsource. If you use the site via your iPhone, you can save the file directly to Passbook. If you do it on your computer, you have to email (or iMessage) the file to your iPhone and save it. Albeit, it's not nice and simple, rather quite ugly for some passes, but if you are patient you can make a couple different Passes. I used it for my Best Buy Reward Zone card and it worked (haven't tried it yet though).