I got like 45 codes in the past 2 hours, all you need to do is reset your IP address over and over and use different emails with @gmail.com (or whatever dowmain you like gmail works good for me) as the domain doesn't matter if they're real prefixes or not as long as you change them all the time. Stuff like akljsdlkajhskad@gmail.com works fine. If you have a BB connection which requires a static IP you're screwed unless you use random proxies or Tor nodes, otherwise just continually reboot your modem which can usually be done through your browser if you login to it at 192.168.1.1 (sometimes the URL for your modem is different) and find the administration setting to reboot you modem.
Anyway, I'm out of codes now. Will post back later when I get more.