David....go to Aircraft Spruce or Chief's aircraft and price them out.
If you let an intercom be a deal breaker on an otherwise perfect deal, then I may have to take back what I said about selling to you in an earlier thread.
You MUST understand that your first year bills on this plane (both upgrades, gotcha's and just PM) will amount to a large chunk of cash.
An intercom system can be as cheap or expensive as you want with portables and lower priced panel mounts being $122 and up (Chiefs) with PTT switches being probably around $10 each plus wiring.
If you intend to expand your panel at some future date, you may want to invest in an audio panel. Used could be $400 for used Narco or King up to $1000 or more.
Personally until you are sure this aircraft (or ownership in general) is your cup of tea, I would just buy a used portable unit, then sell it and upgrade once you know what you want for sure.
I have a Sigtronics SPA400 in my Cherokee ($216) and had a PS Engineering PMA 6000 ($995 with marker beacon) in my Cardinal. Functionally, I can't tell the difference between the two except the cool little buttons on the 6000 were fun to play with.
