I get most of my more unusual herbs at herbal suppliers, they can be found easily online.
For something such as thyme, a commonly used garden herb, the supermarket or grocers may be the best place to go.
is there some kind of store or franchise that sells stuff like herbs and crystals and gems specificially for this kind of stuff?? Or is it better to try and buy them online
Sadly not it is usually independant stores or large online websites that sell them. In many countries and states it is still not accepted or in some cases legal to practice witchcraft.