Yeah I have been up there a couple of times and there's actually about 4 dealers in the area. They are all smaller dealers with the exception of Volo which is really a car museum. That Challenger convertible can be found at
www.hlpag.com I've never dealt directly with these guys but they always have a ton of Mopars that are usually are in need of a resto. I've seen some great deals come out of there and of course the other way around. I' sure they sell a lot of consignment cars which sometime can drive up the price.
I know they have some funny rules like $10 to hear a car run and something else which I can't remember. I think it was something silly like $5 Dollars to open the hood but don't quote me on that call them I'm sure they'll tell you. I'm sure they need to do that in order to keep every tire kicker in the world out of there. My advice is if you see a car you like give them a call because they seem to be a serious Mopar dealer and I would say 75% of their inventory is usually Mopar which is a find in it's self.
If anyone would like any information on the 4 dealers in Northern IL just send me a private message. Thanks