4 Common Dealer tricks to watch out for are:
Some have been tried on me - unsuccessfully I might add.
1.Agreeing to a price and upping it at the delivery point by
a) Just brazenly demanding more $$ or
b) Agreeing to the price and at the point of sale when the salesperson goes the the manager to do the final paperwork, upping the price on the contract. Then when you point it out, apologising profusely for the "mistaken" upped price, or just keeping quiet and internally smiling if you sign the upped price contract. Yes it is a legal contract and extremely difficult, if not impossible to change after you've signed. (tried on me)
c) Financing: a common trick is; the dealer calls a few weeks after sale to say "your financing fell through, we need more money". They blame your credit history. Another twist is they lie, and say "we found you a lower rate, come resign the loan papers." See 1b)
2. Overpriced add ons: such as dealer sold, extended warranties at full or near full price, paint protection treatments which are often pushed after the salesperson has finished with you - they think your more relaxed and less defensive then. You can do the paint treatments yourself using quality protective treatments. Alternate source for factory warranties are available. (tried on me)
3. Trade-in offers at $1000 to $4000 below market price. (tried on me)
4. Orders from the factory. The car should not cost more than the cars on the lot. It does not cost dealers more, but actually less, it's ordered as part of their weekly buying. New car factory orders don't sit on a lot waiting to sell, they cost dealers $0 on interest. New car dealers require a deposit, try not to give more than $500. Don't pay deposits by check, use a credit card only. When the car comes in and they jack the price up saying there was "a price increase", it's easy to dispute it off your credit card. If you paid by check, they cashed it, and you're screwed.
There are some great salespeople out there, they know their facts, they don't mislead or confuse their customers, and they stick to their deals.
Knowledge is power. Good luck.