Wow...
Hello fellow bay area Lexus fan -
In terms of getting the IS250 for under 30k - I assume you want under 30k BEFORE taxes. Because let's face it, even with taxes and registration etc you're going to pay 30k. I'm sorry, that's just the reality of things. If you want one for 29k (before taxes) then read on...
What you were told is true.. there are no "base" models on any lot. The cheapest one you'll find WILL have the 18inch wheels, wood trim, heated and ventilate seats, trunk net and mat etc. This is true. If you want the absolute base model you will have to order it. BUT, you can get the one mentioned about for 29k before taxes. HERE'S HOW I DID IT....
If you live in the bay area I would suggest contacting Lexus of Pleasanton. Yes, the one at the auto mall. Visit their website and send an email request for a price. You'll end up talking with a guy named Eric Hanson (Internet Sales Manager) eric.hanson@hendrickauto.com You'll get a call back the same day. This lot deals quantity sales and not mark up (according to him). I was able to talk him down to 29,600.00 for the Tungsten Pearl / Black Interior 2007 IS250 with the 18inch wheels, wood trim blah blah blah and NO Navi. It's true. I kid you not. He will probably tell you that he can make a good deal if you come in before the weekend.
If you decide to contact them I WOULD NOT jump right to it and say "hey, I heard I can get the car for 29.6." I would call him, let him know you want the cheapest price you can get. Let'em know you've done your homework online and you know that you can get the car for under MSRP. Also, if needed, mention that you've sent off your request to other Lexus dealerships. The guy SHOULD work with you and get you the car for under 30k sticker price. Heck, he sold it for 1,400 UNDER INVOICE. You may want to go ahead and email other local dealers and then get actual prices from there. This gives you the power to throw numbers back and forth with other dealers. In the long run… Pleasanton was the best price and every other dealer I spoke with said they couldn't match the price. They all told me if I could ge the car for under invoice to do it.
Good luck.