Where are you located?  I have a full set of steel wheels & hubcaps, but shipping would probably run $20 each. You can probably find some close to home on 
http://www.car-part.com" onclick="window.open(this.href);return false;  Just look in your state or province, type in your zip code, and look for the 16" x 6-1/2" steel wheels if they are the ones with hubcaps.  You can probably find some for $30-50 each.   Vibe and Matrix wheels will come up.  If you want the alloy wheels, then they are a bit more if you can find them.
There are also a few cars being parted out on here.  Badvibe has a thread on parts and may have some steel wheels.
Good luck!