I have a set of four 15 x 6 JJ steel "generic" black rims available for sale. $145 for the set. If you are near 10589 (NY, USA), I am willing to drive about 2 hours for delivery, otherwise you will have to pay shipping (I'd guess around $80 for the set).
I'm only selling them as a set of 4. (But feel free to break up the set later if you wish. If you can find another owner or three if you only want 2 rims for winter use or for use as a full-sized spare, that's fine, but you do the split of the set.)
I used the rims on my 2004 Toyota Prius between Nov. 2005 and May 2006 (