Chunko, thanks for the kind offer. I will take you up on half of it and buy myself a pint, but I'm really looking for a source for the future, I still have a couple left for now, I just can't believe the cost of the screens.
If china can knock out cheapo plasma torch consumables, they must be able to do a plastic screen?!
Thanks for your generosity of spirit, I will keep looking for a permanent cheap source.
I suspect the market is maybe too small to bother? That might change in the future as 3m announced a while ago that from 2013 Speedglas 9000 series will become obsolete