All of the items above are usually made from steel, brass, bronze and, less commonly, iron. Requirements for special heat resistance are low as no one would ever keep a poker in a burning flame. All the tools are just a part of the interior and mostly perform aesthetic and artistic function. The choice of subjects and manufacturers depends on the owner's willing to arrange an elegant fireplace area.
You can find these very useful accessories in fireplace specialty stores or even some hardware stores and big box home centers as well. A search done on your favorite search engine will provide information on where you can purchase them as well. You can even buy them online but keep in mind that you will pay shipping and handling charges as well.