Floating shelves look fragile to the naked eye because of the way they sit on the wall. All the workings of the brackets are hidden so it seems as though they are floating there on the wall. In reality they are usually much stronger than other types of shelves which are supported with traditional brackets and screws.
When purchasing separately you have the ability to create very beautiful designs that dont look like they came from a box. Brackets for decorative wall shelves come in many beautiful styles and materials. These can also be found in home centers and hardware shops but you may have better luck shopping online. These days you can find nearly everything imaginable online. Having a global market at your fingertips lets you locate dealers who are not available in your town.