A few things...
First off, I finally convinced my dealership to make the plunge and TK Carsites is going to create us a real website - the best product they have, and now I don't have use Nissan's site to let my customers build and search for cars...from my website! I got a big 888# and all calls come right to me, but after the new site is up, I can only imagine how many better leads I'll get right from my own website... so I am glad I am the sole i-Guy for my top volume Nissan dealership... I am gunning for 30+ deals a month soon.
So to sum it up, invest in a nice site with all leads and calls coming to you
Secondly, but sadly I have had to abandon my Craigslist ads, as they were all getting flagged by some idiots who think Craigslist is for the small guy... I'm moving on, it was free, and you get what you pay for!
I did use
http://postlets.com which I highly recommend...
Lastly.. be upfront in your emails... explain this is not the dealer price, but a special opportunity, and by coming in and not asking for you - you are being taken advantage of. In your face is NOW what it takes, and I tell people flat out if they come in and don't ask for me, and I find out - the dealership will cancel the deal!
It's a lie... but who cares, they pay attention when the prospect of losing the deal altogether is possible.