For lens in cell 5" and over there is Istar.
I am a big fan of D&G but they seem to have stopped production for a while. Even when they were making lenses there could be a wait time of 1 -2 years.
For smaller lenses try MASILMW on Cloudy Nights Classified section (ATM parts). He has Carton lenses from Japan and recently has been offering Explore Scientific lenses.
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