Best mailer/safelist/ad exchange networks that have/may have also an option to send a Super Solo to whole network of sites.
I am personally using the networked sites below and also personally recommend them because they are free or cost-effective and deliver me leads based on my tracking results.
16 mailers with a total of 40,000+ Members, option to send a Super Solo
14 ad exchanges/downline builders with a total of 7000 Members and option to send a Super Solo to all sites. One of my Top lead sources.