Here is a suggestion:

Why not have a sign in thread, that could be made a sticky, for the people who purchase the new Cobalt? This would give the other members an idea of what people are buying and the purchase price. The sticky could include stuff such as:

Year
Make/Model
Color
Transmission
Options
Yr./Month of Purchase
Dealership
OTD Price

EDIT: One place you could put this sticky is under the Member's Rides section

 

good idea