Carabiners are everywhere. Any store you go into with an outdoor section will have some sort of carabiner. Most are not meant for overloaded weight or even holding you in a hammock.
If you are looking for carabiners for climbing or holding a lot of weight stere clear if they do not show weight in kilonewtons.
Here is a quick tip to spot a junk carabiner.
Push and open the gate
While the gate is open push to the left or right side of the carabiner
If you can push the gate to the side let alone stay there it should be meant to hold keys and nothing else
