You say your fiancee's credit is bad, but how about yours? Since you have a new car that you own outright, I'd think that a bank would lend you $1000 using the car as collateral. Just make darn sure that you can meet the terms of the loan!
Beyond that all I can think of is getting an unsecured loan, which at your age in this credit market I doubt will be easy for that amount. In other words, an unsecured bank loan, or getting a credit card that has that much of a limit.
By the way, I cuffed up my credit when I was your age with credit cards. Like fire, they are a dangerous servant and a terrible master. Beware.
-=Steve=-
B.S., Info Sys, Charter Oak State College
M.A., Educational Tech Leadership, George Washington University
Doctor of Health Education, A.T. Still University, in progress