We bought our new Mustang GT 4 months ago....we are still getting emails from the dealers we did not buy from. Unless you live in a big city shopping around can only mean email. As to no response, never happens. You will not be the first to buy online, my FiST and ex's Escape were sold by the sales manager/ internet manager cutting out the sales people. Once they get it through their head they are not getting a phone number or you coming in until you agree IN WRITING on a price they will work with you, tell them they are one of three or four dealers you are working with. We have not bought a new car going to a dealership since the early 90's. All four of our new Fords recently purchased by our family were out of state at a price the local dealers would not touch. I will gladly drive 100 miles to save $500 and wait for the end of the month and beat them down for even more. We were lucky that my wife's Mustang had exact matches with 2 in FL, 1 in GA and 1 in NC, her car actually has every option available on a California Special so the 4 cars stickers were the exact same price, playing one against the other determined where we would buy and they all knew it. With the $2000 rebate we had to buy from stock on her car.
I negotiated a deal for my ex-wife in LA for her new Escape, got her a deal in Houston TX that beat all others and with a $99 plane fare, dealer picked her up at the airport and all went smooth. The biggest mistake people make buying a car is being in a hurry. When the dealer figures that out you are screwed. Slow play them, they have a quota to meet every month and will take a $1000 loss on a car to get a $50K bonus for meeting sale goals. All car sales are down big time, a great time to buy!