I have a few pair that I can use. I have the Halcyon version of the RAF Mk VIII goggle.
http://www.british-classics.com/61018.html This one I mainly use for flying, so it doesn't get much MB use. I have an inexpensive plastic-lensed repro of that style that I occasionally use, but the covering over the foam padding is deteriorating. I'll have to replace those soon.
I also have the US M44 as a back up pair.
http://www.sportsmansguide.com/net/cb/cb.aspx?a=101537