Cash flow notes can be found in many ways. Basically it comes down to marketing.
Here are a few marketing ideas that will help find cash flow notes:
Direct mail-You can search search the internet to find companies that will sell you a list of leads and then you can market to those leads with direct mail and sometimes phone calls.
Search public record yourself either online or at the courthouse -Look for Trust Deeds or Deeds of Trust
Place classified ads in local papers indicating you buy notes
Place online classified ads
Network with attorney's, Accountants and other local professionals