Stowed weapons (1) weapons (2) weapons (3) armor (1) armor (2) armor (3) medical kit (1) medical kit (2) medical kit (3) medical kit (4)
GTA5 single mode has a lot of props that can be obtained for free, including weapons, armor and medical kits. Where it, see this "GTA5" weapons armor medical kits free to obtain the location of the list.
Weapons
Shovels
In a factory next to the Oceanic Highway in Perito Bay
Petrol bombs
In a tunnel under the Oceanic Highway in North Kew Mar Market
PS: This is a little hard to find!
Grenades
Under a house on Inishenu Road in Chuma Market, you have to walk to the beach to find them
PS: I don't recommend this side of the road, sometimes it's a bit hard to see ==
Located at the end of the hiking trail opposite the observatory
Sometimes the color blends with the ground and it's hard to see it (the red circle)
PS. Relatively easier to find than the above
Golf clubs
Method 1: Go to the golf course and hit a passerby who has a golf club.
Method 2: Solve random quests for golfers and you'll get it! (The picture will be added some other time)
Baseball Bat
There is a baseball bat at the stadium in Lichtman University
PS: There is another place in Los Angeles that has one, so I'll add it some other time.