Advice on leads in Portland, OR?

I am just starting out on 100% commission as a Mortgage Banker. I have worked for big banks before on salary plus as a loan officer and I have a lot of related experience. My concern is, once I exhaust my current leads, I won't have any more business. Other than simply calling/mailing real estate agents, going to open houses, etc...does anyone have any creative ideas or things that have worked for them in the past? I don't have enough local business to rely on referrals yet either, so I need to generate new business. Any advice is greatly appreciated.