Can't say I am familiar with McIntosh room correction, but the idea that implementing it would cost $4500 to $7500 is bizarre. I stay away from room correction in two channel, but I do use ARC correction with my Anthem AVR.
Everything (microphone, cabling and mic stand) came with the AVR and doing the room correction took about 15 minutes.
I would source out a HT or McIntosh forum. Surely someone can provide some answers and help.