It's been a while since I played, but I'm pretty sure it's on the beach, near the main base. The best way to get these things, get some seeds for it and start growing them in pots at your primary base. That way everything you need will always be in one central location. I got a whole garden growing on top of the convenience store.

Originally posted by tyr0xxx523:

Ive been looking all over the map and can't find it

I found one at the beach.