The convention center is literally across the street from Disneyland, so there are tons of hotels right there. Price-wise I don't really know much about where to go because I live here and I don't really ever need a hotel. There's always Motel 6!
If you have time, you should go to the Guitar Center on Sunset Blvd. in LA. I normally wouldn't recommend going to a GC, but the one in LA is rad because it has the hand prints and signatures of a bunch of rock legends in the cement out front. I put my hands in Jimmy Page's handprints. They also have an amazing vintage room with $50k+ Strats and Les Pauls.
There's also Amoeba Records on Sunset. I believe it is the 2nd largest record store in the US.