spencie,
Most of the airlines offer tour packages. I've had luck with USAirways and American Express before I got the rooms at casino rate or free (hard to beat free) LOL
I don't know if American Express still has a tour office. For some reason I think it has closed, but worth a look anyway.
If I was retired, and had plenty of time, i might look into things like priceline. But I need definate flying times and lately I want a decent airline schedule.
Don't forget about Phil's LA times room rates posted by Beth every week. Some of those are great.
I'm guessing Tour operators are having a tough time since 9/11

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