Get the listing sites to do the searching for you. Here's what I do when looking for a vehicle:
First, NEVER give a dealer or listing website your real email address or phone number. I only provide this information after the deal is done and we are doing paperwork.
Go to one of the popular free email sites (Gmail, Hotmail, Yahoo, Outlook.com, etc), make a "burner" email account. Only use it for signing up for things like this. You're gonna get a lot of spam to this account.
Now go to all the popular vehicle listing sites (AutoTrader, cars.com, carfax, etc), create an account with this email, and create a focused search criteria for the vehicle you want. Subscribe to updates. These sites seem to run a "scan" of their listings in the middle of the night, every night, and will email you listings that match your criteria.
Get up each morning, get your coffee and laptop, sit down and check the burner email for listings that have been sent to you. As you eliminate a candidate, delete the email(s). Often you will get the same vehicle from multiple sites. If you find a car you want to look at closer, email the dealer directly with this email, no phone numbers. If it's too far away, see if they will put it up on a lift and get pictures of the underside. If they won't, move on.
My experience is that even when you tell dealers that you have purchased a vehicle and are no longer looking, they will sign you up for all kinds of crap, special offers, sales, etc. They don't get the message when you try to unsubscribe. Hence the burner email account, that you can now ignore.