brake line distribution block

Changing the 64 ply belvedere and62 Dart (B body) over to dual master. I need 2 USED distribution blocks total for 2 cars. NOT proportioning valves for drum brakes.
I know I can order new ones from Inline Tube, but does anyone have some used? or source for new that won't be quite so many $$$?????
There is not a yard around here with anything old.