At the link I posted up thread you can see exactly what they are.
They are made by several different companies and prices vary greatly with different dealers. Shop around.
You can also get different kinds of wrap.
The single roll, table top model is what you would want to for home use.
If your grocery store has a meat dept they will have some in the back. Ask the meat dept Mgr if you can look at one.
Very easy to use and Faassst!
I still use a 2 ply poly freezer wrap. However,no matter what one uses for wrapping the package must not have air inside. About 28 years in the meat business taught me that.