or this http://cgi.ebay.ca/Kodak-No-3-Dark-G...5#ht_500wt_749
Have you considered using IR? You can buy Eyeclops IR goggles for about $50, and they come in handy for other things.
f/22 and be there.
I second IR - I do DBI with IR and It is far easier than the green safe light approach.