In the U.S. at least, many cars are sold at dealerships, where a staff of salesmen work for the car dealer.
Buying a car from a dealership is not at all like buying a jar of spaghetti sauce at the supermarket. The spaghetti sauce has a price tag, and that's the price that everyone pays. The car may or may not have a price tag on it, and, even if it does, many walk onto the dealership lot knowing full well that the stated price is negotiable.
Customers can offer less money for the car than the quoted price. The dealership may also offer incentives (such as extended warranties, a lower interest rate on the car loan, or more money for a traded-in used car) in an effort to make the sale. In short, buying a car is a more complicated ordeal than buying that jar of tomato sauce, fraught with much less certainty and much more haggling.
Getting a good deal at the supermarket means that spaghetti sauce was on sale that day, or maybe you had a coupon for 75¢ off (or maybe even both). Getting a good deal at a car dealership is not quite so simple; however, car dealers will advertise savings events from time to time, where customers can take advantage of:
- reduced prices, designed to move end-of-year models off the lot
- low-rate financing
- low (or no) money down on the sale
- free extended warranties
- a guaranteed minimum on your trade-in, no matter how bad your current car is running
As for "They are talking cars and deals," you haven't told us where you saw or heard that sentence, so it's hard to say for sure, but I'd assume it was either a car dealership promoting a special sales event designed to bring more customers to the dealership, or else a car salesman and customer engaged in a discussion, in the process of negotiating a possible sale on the lot. The deal in this context is the final transaction that gets the customer to sign a contract that will eventually lead to the customer driving the car home off the lot.