the van wheels will need spacers etc as they are the wrong offset.
the r100 wheels will cost you about $200 each if you are in the eastern states.
there are some saab/audi wheels which are 4x109 i tihnk and you can jam them on but they WILL eventually fall off as you can never get the bolts done up correctly.
ive looked at this in great detail and the only other options are to have custom steel rims made up ($$$$$) or buy some alloys.