Business cards are a great idea to get you name out.
Several suggestions:
1) Do not mention or print the word "furlough" anywhere. It gives the impression your are just looking for a temporary job until you are called back. Explain your status once you get to the interview.
2) When you hand out your card, ask for one back. Follow up and they will know you are serious about your careeer.
3)While working the line provide superior service. It will get noticed and it will open up opportunities.
Good luck and stay with it!