Foam Board

Hey everyone, I’ve been surfing for about 2 years now. Started with epoxy and now I’m riding a 6’2” fish. I enjoy surfing tourmaline here in San Diego but the problem is the spot has zero etiquette and is overcrowded (sometimes 50 to 60 people). Recently I had someone go over the falls and shoot their board at me. Their board hit mine and caused a decent amount of damage. After some sanding and applying solarez I was able to get back out in the water. The individual laughed and asked if I was ok. After seeing him a few more times it was easy for me to reach the conclusion that he has no idea what he is doing in the water and the thought of either of our boards being damaged didn’t cross his mind. I now want a foam board on those crowded days so I don’t risk damaging a nicer board. Does anyone have any recommendations on where to get a foam board? Costco seems to be good for the wave storms but I was curious if there were any specific shops in San Diego. Thank you.