None of the scripts of Tyler Perry's stage plays are currently available to purchase, as none have been commercially published. However, it is possible to access copies of the scripts of the film versions of the plays.
As most of Tyler Perry's plays are now films, who you could buy a DVD version and write out your own transcript, but this would be painstaking and would also need to be for your personal use only, due to copyright issues.
Where Else Could I Get A Tyler Perry Script?
Other options include checking online auctions sites to see if any of the actors who have worked on Perry's plays are selling their own copies of the scripts, or by writing to them via their agents to ask if they are willing to sell you a script. Permission to stage a play by Tyler Perry must be given by whoever holds the play's copyright, so check Perry's agency first.
Some of Perry's plays are available in full on YouTube, but access depends on which country you are living in. Clips are more freely available, such as this one from Madea's Neighbors from Hell (2014):