Millennium Biltmore Hotel Los Angeles is a bit pricey $200 a night
super cool upscale hotel with some major history

But on a budget just down the street is http://www.stayonmain.com/it is a hostel/hotel and very nice on a budget, we had a downtown L.A.
history/bar walk that John-O organized last month & many of us stayed there
everyone whom did liked it, modern & clean, Cole's is right around the corner.

Do you need to be somewhat close to Whittier and Downey? Just East of Whittier and Downey is Buena Park. It's the home of Knott's so there is lots of lodging and since the Halloween Haunt is over, it is off season so it would be inexpensive. And this would include Knott's own hotel.