So here goes, unless the codes are already all gone (don't think so, just sent one off and got a code), I think this could be a great way to get some codes out to people who do not have any friends with available invites.
Was thinking that we could go like so:
People post here how many invites they have available.
If someone needs a code, they then PM that person an e-mail they want the invite for. Proxy is ok (like if you would like to give a code to your brother who unexpectedly expressed an interest in the game, but you already used your three)
Please update your post if you run out of invites.
Note, for this to be safe DO NOT post any email addresses directly in the thread! I would also suggest using a dedicated e-mail for this just to be extra careful.
I have two one no invites available.
All my invites are now gone. Enjoy!