Where to Look for Southern California House/Apartment Rental for 1 Month?

[Baltica]

Does anyone have any suggestions on where I could look for a reasonable rental of a house or apartment for a one month summer vacation for a family of 4? The San Diego area would be ideal but anything between Oceanside and the border would be fine. Extra points if it's not too far from the coast/beach. The hope is that rental with a monthly discount would be less expensive than, say, three weeks.

I've already had a look at Airbnb and VRBO. Any other ideas?

 

[cruisehopeful]

Those are the only 2 that came to my mind. You could also just google "vacation rental Oceanside" and "vacation rental Carlsbad." Both of those cities are full of vacation homes.