hammock hooks / plastic puzzle cubes

I always see these metal jaw harp shaped hooks, and I was wondering......

1. what they are
2. where to get them
3. how much they cost


I apologize for the double topics but i'm trying to do major cage remodels

I just bought a sewing machine yesterday, and I have yet to set it up, so I'm planning on going sewing crazy. I used sewing machines in high school, and a few times since but it might take me a bit to remember how to do everything! I'm just planning on making the basic hammocks for right now but I need ideas for how to hang them!

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about the plastic puzzle cubes. I see them in cages when people post pictures. They are large plastic squares that fit together to make boxes. I looked at targert christmas tree shops, and walmart but I have yet to find them. Do they make them anymore???

Will I actually find them if I go to a major toy store? This will save me some time if I know I shouldn't bother looking for them

OK thanks for the help.....I'll try to post pics of the cages when they are done!