need signups for listmaker.biz

My partner and I have just created a new site called Listmaker It a mailing list building website aimed at net marketers. It was brought online three days ago and already has 1,000 members. We will fully launch in a few days. I am interested in increasing my downline membership and am initially looking for quotes for 1,000 members (leading to much larger order if all goes well) These members must understand the concept of what they are getting into (they will be able to build a huge mailing list for free, and will therefore receive some mailings from time to time!). The service is FREE but does have a paying membership option. The site is having a massive launch within the next few days so i want to get this new increase in membership before as much as possible. No fake signups, rubbish paid to sign up leads etc... must be quailty signups froma quality source. I want to know how and where these leads will come from. I monitor all members and I will know if these signups are rubbish, so if you have poor methods of obtaining these signups then forget it. no money upfront, but escrow is possible. You must guarantee quality signups!