There are two places that I have used for cakes and I would recommend.
Call TWIGGS BAKERY and ask for Dan, he makes a fantastic WHITE VELVET CAKE.
Twiggs on Adams
2804 Adams Avenue
San Diego, Ca 92116
Also contact the Grove Bakery in Lemon Grove, they specialize in large orders. I have used them many times and have never been disapointed.
3308 Main Street, Lemon Grove