One option to purchase custom storm doors is to visit Lowe's or The Home Depot and customize a door from the available choices of frame and glass, color, finish and screen type. Another option is to commission a customized door from a company such as Screendoors.com or George W. Trapp.
Lowe's offers advice on customizing a storm door in its online Storm Door Buying Guide. The Home Depot offers a storm door selection tool linked to Anderson and EMCO storm door brands. Click Find Your Storm Door, choose either Full Light or Partial Light, and filter the results by venting options, colors, glass options or features. Screendoors.com and George W. Trapp craft individual doors of almost any size to customers' specifications.