Last night out of the blue I decided to check on it. Guess what, there is this website kind enough to publish a bunch of codes every day, only that those codes need to go with a specialized registration entry other than the standard one. The specialized entry looks exactly the same as the standard one except that the address contains extra source verification code, I guess so that uszcn could match the verification code to where it comes from.
A slight drawback though. The lines of codes you see in the screenshot, that is actually a picture, meaning that you cannot copy and paste when you register. And this is where OCR comes into play. http://www.onlineocr.net/ is such an online tool that gets things neatly done.
So a little early than 11:30 today, I had filled all the fields in the registration page except for the invitation code. The moment that today's codes were out, I saved that picture and ran OCR on it. I'd planned to try a few codes before I could succeed, so many people out there for such a short list and stuff. But with the first code I tried, I got in! Guess OCR ran faster than typing manually after all :-)

may you give me your invite code ? :(
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