If anyone in the uk is still stuck for getting a black parade tshirt for whatever reason, I've finally found a shop in london that sells them.
Www.banquetrecords.co.uk - its a shop in kingston (just south of london)
Not sure if you can order then off the website but they definately have them in the shop :-)
They had them in all sizes for a tenner.
Hope that helps someone :-)