Lien on someoneone's salary

I was awarded a judgment in small claims court for $3,000+ against a former roommate who skipped out without paying two months' rent plus inflicting damage on property. A city marshall used bank account info provided by an assets locator but the account had been closed by the time they reached it. I am wondering what else should I do. I am considering somehow finding out where this individual works and having a lien placed on his salary (if he collects one, that is). He is quite a slippery person; as a hairstylist, he works a lot in cash. This whole process seems like a lot of trouble to go to but I could really use the money from the judgment. What are your thoughts on this situation? What should I do?