Have one brand new, never even opened the shipping box 8" / 200mm Bahtinov mask made by Morris Engraving in the UK for the GSO 8" RC scopes - will also work on any other 8" scope. These are made from hard acrylic, and not flexible vinyl like most. They hold their shape perfectly.
Same as this:
http://www.ebay.com.au/itm/Bahtinov-...bf388f5&_uhb=1
I will sell mine for $30 including postage across Aus/NZ.