'Bout anywhere. Wal-Mart, K-Mart, Advance Auto, Auto Zone, online somewhere... You have loads of choices. You could even troll the local or online yards to find some factory units.
I think the BATinc.net site says their factory lights actually do fit the Mystique, but I don't know for sure. Search to see if you can find info on that... [BAT fog Mystique] with an 'and' operator should narrow things down nicely.