These are now hard to come by but for those of you who have them if your actual 'Screen' is beginning to look a bit the worse for wear I've just sent my old 'Spare' screen over to Eagle Screens in Perth, Wwestern Australia and they are going to be making a mould from it so they can put them into production.
Obviously if they get orders for multiple screens the cost will be lower so anyone who is seriously interested let me know and I'll pass on the expected numbers.
Note this is only for the Perspex or whatever screen itself. It won't include the NLA mounting bracketry. They can also do tinted versions too I think.