I had it in my lease agreement "That  a tenant shall not park their vehicle(s) on the lawn or any other place on the property not designated as a parking area, or their vehicle will be towed at their expense"  and then saw they had a vehicle parked on the lawn or other area when I did a drive by, I'd take out my bright pink "Parking Violation" Sticker, stick it on the window of the car (under the windshield wiper) letting them know that they had 24 hours to remove the vehicle or the car will be towed.  

Then I will have to raise rents more drastically, and everyone gets "sticker shock." 

Make up stickers with your phone number.

Some others sell special bags or stickers to put on bags.

Understand the perspective of the networking potentially worth much more than the sticker price as well depending on a varying perspective. 

You can usually find it on a sticker on each appliance.

As far as a $1,000 budget, I would probably do a few things:1) design and buy a back window sticker for your car (or tailgate of your truck) so when you’re driving around folks will see what you do (very cheap and effective advertising).

Wholesalers, yellow letters, bandit signs, guerrilla marketing, website with seo/blogs, vehicle signage, shirts, bumper stickers, business cards, door knocking, networking, realtors, TV, radio, and other things I'm forgetting.I agree with Mathew that contracting also scales and supplements your business.

You could also get nice professionally printed cards and then print your own sticker to put on the back, if you want.The reason I do that is that it's kind of common to get lots of business cards at one of these meetings, and then have a hard time remembering what that person *does* when you look at the card later.  

This would reduce sticker shock and your touch time.Not sure if a site is feasible (if you have enough properties to justify) but having a link to a webform where they do the pre-screening as part of the initial contact would reduce your touch time.If you are in a high rental velocity area they may be getting into other places by there time you responding or if they feel it's taking to long they may move on?