I just bought some 582 low deck 4.600 pistons for an 18 degree head 1400 bucks. came with rings.

Just priced some b1 pistons 1800 bucks with rings.

But in general I agree that Chevy stuff ain't cheap either. Those Brodix,Dart style Chevy blocks aren't quite the the same thing either. Serious Chevy aluminum blocks are 7500 plus if you want real race chit like cross bolted mains and all the really good stuff.

I think it just comes down to economics, supply vs demand. Mopar stuff is low demand and even lower supply.