New car dealerships don't budge much on price but typical negotiation techniques are always worth noting.

Time is on your side (unless your wife thinks different) so be patient and persistent with them. Dealerships like to move inventory even if they are not making money.

I think I read somewhere that dealerships standard markup was 15-20% of what they bought it from the manufacturer for. So keep that in mind when negotiating price. A $25,000 car will not be able to get more than $3750-$5000 off without the dealership losing money. Realistically, I don't see you getting more than $2000 off unless you are really good and/or the dealership is desperate (I don't think dealerships are having trouble selling Camaro's now though)

Shop many dealerships and try to convince the dealership where you are at that somewhere else has got a better deal. My brother-in law would even say all kinds of things were wrong with a particular car even though he really didn't know just to get the seller worried that the true value was less than what they are selling it for. (Although this won't work at a new car dealeship because they don't have problems)

It is important that you convince the other person/dealership that the car has less value than what they are selling it for.

It is well-known around the world that Americans don't have any patience when it comes to negotiating. Foreign negotiators use this to their advantage. So when at the dealership, don't rush into a deal and expect for it to be a week long or more process. Time will force the dealership to want to make a sale.

Talk less and be quiet when negotiating price as it makes the other person look for words to say. To take words from Dave Ramsey, just say "that's not good enough" and be quiet and let them try to talk you into it. The awkward silence will make them try to find ways to compell you to buy.

Like you said, knowledge is power so learn everything you can about Camaro pricing, options, disadvantages, advantages, and etc. on the car

If you are buying in cash it will give you an edge, and if you are financing I recommend using traditional bank auto loans instead of dealership financing. Dealerships make most of their money on financing and extra options like (unnecessary rust-proofing)

Anyway, good luck! Sorry if I ranted a bit, negotiations are interesting to me and a big part of my job is to negotiate federal government contracts.