I have a directory sender that I bought a long time ago that I am investigating if I could share it and if so, I will send it to you. It has around 3000 directories, not all work, but many. Meanwhile, I found some users of free directories.
This allows you to send to more than 350 free directories. 350 is a lot and I do not think I need more, but I could also add directories manually to the list that I create.
Here are some more links I found on the web. I have not tried them yet, but if someone knows more about them or has any chance, please share your opinion.
Good luck =)