Always look for the free avenues first before putting down any dollars as you are running lean as it is. Look to on-line forums, groups in your target market that are discussing the subject area and begin engaging and sharing insights to show credibility for your offering. As you move forward, begin to request advice in developing the basic product offering. You can then start providing incentives like entries into a draw to this focused target market, as opposed to general contact lists that get very little conversions (unless it is a targeted e-mail list). This should get you started.