IR non intrusive portals

[analyst34]

Can I get some info on some contacts for non-intrusive IR inspection ports to be used with a 65deg. lens.
One sample I recieved from a vendor of our camera runs at $75 a pop... a little high.
any suggestion would be highly apprciated and considered.
Uncertain on the size of the lens that would attach to the port, this is on back order and waiting arrival.

 

[EEIre]

The price seems about right to me.

I remember purchasing them a few years ago, the material is expensive as you cannot use standard glass or perspex.

The name of the material escapes me!! Sorry