For your zip code, per this Directv database:
www.directv.com/rsn You would need Sports pack for $12/mo (or the $115 premier package) to get the Reds & Cardinals now:
With any DIRECTV base package (CHOICE or above, or MÁS ULTRA or above):
FSN South (Ch. 646) - HD Available
?Braves (HD Available)
?Memphis Grizzlies (HD Available)
?Nashville Predators (HD Available)
SportsSouth (Ch. 649) - HD Available
?Braves (HD Available)
With the PREMIER or LO MAXIMO package or any DIRECTV base package plus SPORTS Pack, you also get:
FSN Cincinnati (Ch. 661) - HD Available
?Reds (HD Available)
FSN Midwest (Ch. 671) - HD Available
?Cardinals (HD Available)