Today Github has announced private repo’s are now unlimited for upgraded accounts, for organisations the starter package was 10 private repos for $25 a month, this has been upgraded to $9 a month after the first 5 users still at $25 a month but with unlimited repo’s.
Personal accounts also have unlimited repo’s but $7 a month, whilst there are services like bitbucket that offer free private repo’s I’ve never taken to them in the same way I do with Github. Personally I prefer the Github so this is really good news!
Read the full announcement at https://github.com/blog/2164-introducing-unlimited-private-repositories