I'll let you configure it the way you like, but Edmunds is still showing invoice for 2008 models:
http://www.edmunds.com/acura/tl/2008/index.html#search=open.eq..amp.p.eq.cvehicledata%23%23-1%23%23-1%7E%7Enf12%7C%7C4163757261
Make sure you check the Incentives link:
http://www.edmunds.com/new/2008/acura/tl/100902913/incentives.html
It says there is $3500 of Marketing Support that the dealer will not disclose to you. So if the invoice of the car you want is $35000, do not pay more than $31000 for it.