Ok, its a 19.5 to 20 mm diameter 50 mm FL co2 cutter lens.. Who has the best deal, NOT EBAY, must be a legit supplier, need 2-4 for work... Will buy more if ordering 10 halves the price or something.
125 watts, simple co2 cutter at work. Need a good coated lens, not reworked or low cost offshore junk..

ideas?
Best quote I have so far is 165$.... each.. The 50 mm FL is popular, so it gets marked up in price... can vary FL about +/- 5 mm.

Steve