Looking for fiberglass mat/cloth, polyster resin and body fillers in the SD area. Anyone know where to search? Thanks.

Try a automotive paint store. They have that sort of stuff in my area. Either that or they can lead you in the right direction.

Home depot and Lowes has everything you need.

Whatcha working on?

How much do you need ?

If it's just a small area for repair, you can get a ding repair kit from most surf shops.