what 4 speed auto transmissions can i use? 46rh etc

I can't find anything either. I did find a guy who is selling one and said it's brand new from mopar performance so I want to see what they are worth new. But on the mopar performance website they don't list prices in their catalogs. Is there somewhere else where I can find out a price? Is mopar performance a place where I can buy from or are they just an information site.