[javac]

You can get an idea of invoice by going to kbb.com and pricing out a vehicle with the options. There is some variance, especially if there have been price increases and/or because of advertising(roughly $400 to $500 not shown in the invoice at kbb.com).

Can you tell us the dealer's name? You can also look at dealer inventories through kbb.com, though it is not 100% accurate, because of the games dealers like to play with their inventories. Also, you need to know exactly which options the car has; HID, NAV, Protection Group, Walnut, Sunroof, etc.

And, what is the sales tax in OH?

Also, there may still be a rebate on the 300C; it was $1000(check with other dealers to see).