You’ve already been told “now you’re learning blah, blah, blah” which is said in response to every such post (meaning thousands of times on FA) and isn’t really a useful “learning experience” at all, yet will invariably be said by somebody. However, sandyclaus has gotten you on the right track by suggesting one actually useful way to skip trace and by implying the lesson that all similarly situated should learn: don’t sue first and then expect to enforce a judgment; develop your enforcement plan and then sue.
Expect to get your judgment and don’t expect your judgment debtor to cooperate. If you’re wrong, you’re happily surprised. If you’re right, it’s less likely that you’re frustrated, disappointed and writing things like this.
The amount is too small for an attorney or agency to give it attention but, within statutory limits, post-judgment recovery costs are recoverable. Resources to skip-trace are much, much greater than they once were, but the average person doesn’t know what attorneys and agencies use or how to access them themselves.
Use Google to find public record providers (since I don’t imagine that you subscribe to any yourself). There will be a nominal fee for the best, but it will be much small then you’d pay to a 3rd party, If this is your first time doing this, a place to start is http://www.journaliststoolbox.org/archive/public-records/ . Useful sites are listed, but none can be endorsed on FA, and you’ll have to separate the wheat from the chaff. It’s also time to use your imagination.
In addition to sending a certified demand letter, forwarding address requested,
Did you make any payments that were negotiated and have checks with his bank endorsement on the back?
Does he have a registered fictitious business name? It’s associated with an address.
Is he required to have a tax license registered with the city/county?
Is he required to have a professional license, like an auto mechanic might have?
Do you know if he’s in a union?
Did he work for a person or entity required to send him a W-2 or W-9?
If he sold the business, is the new owner still making payments?
If he sold the business, does the new owner know his whereabouts? Is there a non-compete?
Is there useful skip-tracing information on his old business lease and/or his old residential lease?
Is he/was he married and can a spouse be located by name?
Is there anything in his criminal record that would help you to find him? Was it recent and is he on parole?
Who were suppliers and are they still?
Did he learn his craft in the service and is he in a reserve unit?
Is he/was he involved in any other court cases? Current status?
Residence or business neighbors know anything about current whereabouts?
This is just the tip of the iceberg. Have you tried obvious sources like asking for new telephone listings in the city or checking Google. (I once won a bet by tracking somebody from the West Coast to a home telephone number in N.Y. starting with only his company name and using only Google and Linkedin.) Tried Facebook?
If you don’t find anything immediately, try public records again in 6 months. It can take time for data to catch-up or be renewed.