I am going to place an order with a CN company that has produced many optics for me in the past. I have ordered composite vanadate crystals, polarizing optics and non-linear crystals. I will be ordering a few low order, 1/2 plates for 460nm. If anyone would like me to add to the order let me know. A couple of years ago the coated, 10mm aperture, mounted low order 1/2 wave plates were $65 each. The current price depends on quantity, but I suspect the quote won't be much different. I'll have to see. If you are interested, let me know without commitment and I'll get an actual price and delivery estimate.