Sounds like a direct marketing job. Not illegal per se, and, in many people's opinions, not even wrong. It's targeting a specific consumer group, the same way a company may want to target "homeowners" or "paintball players" or "people who drive Chevys." The fact that the particular group being targeted may have financial problems is irrelevant in the grand scheme of marketing.
Personally, I wouldn't feel great about writing a direct marketing letter encouraging people with more than $10K in credit card debt to declare bankruptcy, but that doesn't mean it's wrong. A lot of people wouldn't think some of the writing I do is "right", or "moral" either.
The way to do it might be to contact credit card companies and see if you can buy their mailing lists... Or, I bet there is a mailing list available somewhere (for a price!) that has a good portion of these people compiled together.
To answer your question, RowdyMama, I don't think there's a cost-effective way to compile the information "by hand".
Dawn