There's a great resource I use for finding cards called Zorbec's Decklist Builder. You can sort by card type, culture, game text, most anything you might want to find. There's a download for it here:
http://eric.minet.free.fr/tcgbuilder/dbdownl_en.htmGive that a shot and see what you come up with! You'll want to select the Free Peoples tab at the top, the
culture icon, "Comp." for companions, and then open the Advanced Filters tab, go to the third tab on that window (Filters 3), click the plus sign next to "Cost," and then check the "Cost reduction" box.