I found this item on Ebay for lower front control arms/pair. About $600.00 shipped.
http://www.ebay.com/itm/Specialty-Products-94378-Set-of-2-Lower-Control-Arms-for-Impala-Grand-Am-RWD/141671918280?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2060353.m1438.l2649
http://www.ebay.com/itm/Specialty-Products-94378-Set-of-2-Lower-Control-Arms-for-Impala-Grand-Am-RWD/141671918280?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2060353.m1438.l2649