I think it is always better to make your own tools. This imbues with your personal energies from the git-go. However, I have bought several tools and after removing the energies of the person who made them and then recharging them they seem to work almost as well as my hand fashioned tools. All of my altar deities have been made by other artists but the deities are happy to reside in them.
So id you are the least bit crafty, i suggest making your own. If not, then purchase them and perform a cleansing ritual to make them suitable for ritual use.