I've bought 2 complete 65 units, including all the under dash boxes, dash bezels, controls, etc as well as all the under hood components - all the hoses/lines, special horizontal drier, the AC crank and water pump pulleys, compressor and condenser. I paid $300 plus shipping for everything on each set-up. 2 different sellers here on FABO.
EDIT: Those under dash boxes are for 65/66 early A's - won't fit 67 and later without mods. Plus the 66 Dart heater/AC panel is of course unique to a 66 just as it is on a 65 Dart. Valiants/Barracudas are also unique to each year as well