Sounds like you looked up Aero Hobbies and Brookhurst Hobbies already since you mentioned stores closing at 8PM.
There is a great shop in Pasadena called Game Empire that closes at 10 on Mondays and Tuesdays and at 11 Wednesday through Saturday. Pasadena is a hell of a hike from
El Segundo, though.
Here is their site just in case you want to give GE a shot.
http://gameempirepasadena.com/