You should check KBB.com and ebay for completed auction that actual SOLD close to you. You can also Check NADA. Remember you are not a dealer, When you sell a car you are not offering a 30 day warranty. there is almost no way a buyer can come back on you and your not going to get them financing. So when you see a dealer selling a Camaro around you in the same condition expect to get about 65-75% of the price.

Spring is the best time to sell a Camaro, if you wait till fall it value will drop another 20%.