I am in the same camp as Holly and Jim for the most part as I don't offer discounts but I also never bring a contract to a consultation. And to that end I don't offer a "book now" incentive, I want them to go out of there and talk about me. If they like me they will, and 90% do, call me back to put together a collection for them. Of that I close about 75% which is about right for where I want to be. They can tailor their own collection to their needs and there are incentives (purse books, etc) for bigger collections, but that is only as a way to get them into a larger collection. Buy more, get more.
If they need to save money then I try to alter what they WANT versus what they can AFFORD at my prices. It may be shortened coverage or something along those lines but I never change my price without them giving up something. Once they get it in their mind that they can get you to drop your price without getting something from them, they will keep doing it.
Don't be afraid to say no. If they truly like you and your work they will find the $200 or whatever that you may feel you need to give up to book them. If you don't value your work, your clients certainly won't. And once you agree to a price, especially if you did give them a "deal", then you need to make sure you still give 110% as you would for any other client. All to often we read about people moaning that they cut a deal and under-priced themselves and now are trying to find a way to skimp or their attitude toward their client now sucks like the client did something wrong. To those folks I say, "Hey, it's not the client, YOU agreed to it!"
Good luck!