There is a little bit of misinformation concerning the cost of ET mirrors and how much mirrors should cost in order to be considered "good".
Our "General Purpose" beamsplitter, for the Quasar alone, is $540 out the door. The reason is simple, our purchase numbers are now into the thousands. IF we were to buy a few at a time, our cost alone starts at around $3k. So even at a markup everyone would feel good because they were paying thousands of dollars for a high-end beamsplitter double coated substrate. Now, with volume its not necessary to pay those prices so its important for people to realize cost does not necessarily equal quality.
Now our premium Schott water white 3mm precision ground and polished beamsplitter with our very own secret sauce coatings we sell for $5000. This mirror is a touch under $20k for one piece of coated substrate. But luckily for us we purchase a hundred or so and the price goes dramatically down. If those of you feel better by spending in the $20k range, we can facilitate
For those who want more information about the mirrors we supply, you can go to our site. We are more than happy to make it all public info: