I did something eerily similar for a CPA type of offer, and I see no reason why it wouldn't work for you. It involves leg work and networking, it's not easy but before most offers took a nose dive, it made me some major bank.
I took the initiative and printed out 500 copies of a basic "sales" letter and went to depressed areas, I put them on cars at unemployment centers and under main entry doors of apartment buildings. Granted the offer was geared toward becoming more employable/less fireable.
I also started leaving unique comments only on employment/job searching boards all over the place (online) found through drop my link. I also hired someone on eDesk to start topics (I gave her the topics as well as forums to join, with how I wanted the signatures to look). It resulted in major bank as I mentioned.
Believe it or not, the employment center tactic (it's an obvious target for my market and NOBODY else was doing it) ended up with around 254 conversions for the 5 field form... Online was far higher, but the offline tactic made my brows raise a bit.
Hope that helps a little.