I am slipped on Harbor Island in San Diego. I am paying $530 a month for a 40 foot slip.
My marina allows live aboards, but there is a long wait list, and it is an extra $300 a month per person or something like that.
I do not live aboard
...but when I fly out from Colorado and stay for a week or a long weekend, they do not mind at all, and I do not have to pay extra. My fee also includes a gated parking spot, which is nice.
I hear that there are slips a little cheaper in Chula Vista. And there is almost always temporary mooring balls if you do not mind dancing around a lot.