I am uncertain what you mean. If you are referring to the Theatre Magic store in William's of Hollywood at Universal Studios, it no longer exists. If you are referring to Ollivander's, it is in Islands of Adventure nearby where the Duelling Dragons/Dragon Challenge used to exist in the Wizarding World of Harry Potter Hogsmeade section. There is another Ollivander's in Universal Studios in the Wizarding World of Harry Potter Diagon Alley section. If you are referring to Weasleys' Wizard Wheezes, it also is in Universal Studios in the Wizarding World of Harry Potter Diagon Alley section. It is a large purple and red building with and enormous animatronic man and is very difficult to miss.
Trevor is 100% rigth. Good advice!!
Trevor couldn't said it better! He is right if you are referring about the Harry Potter stuff it all located to the back of the park
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