Ollivanders wand shop is the main store to by both the interactive and non-interactive wands in the parks. There is an Ollivanders shop located in both parks. The one here in Hogsmeade is quite a bit smaller but is still worth taking a look inside. They have replicas of the most popular Potter characters as well as some unique designs used for the wand show.
Like the store in Diagon Alley you can participate in an interactive show where 1 person (usually a child) is chosen to test out wands until you find the perfect one just like Harry in the book/film.
Previously the show would hold a number of guest and 1 person would be picked from the group to try the wands out but due to covid they now only allow 1 group at a time. They also asked before we went in who was hoping to get a wand today. We let our youngest try with some help from big sister, she was a bit scared at the effects when she got her chosen wand but otherwise had fun. After the show you have the option to purchase the wand or you can choose a different one for purchase just let the team member know.