If you want that level of service, pay them, don't expect TER to give it to you.

Are you kidding? And who is going to manage it?

Here's a better idea. Sit down and pay attention to the ad boards and escort mall ads. Create your own. Besides, provider's calendars on their websites are largely not used and inaccurate. Most providers can't keep their profiles accurate let alone a calendar which needs constant attention.

There is no substitute for your own research.