I feel that maybe a presentation of a group buy is a good way to gain a few of these units. I have done some investigation of the ND:KGW crystals....nice! Expensive but have an efficiency 3 times greater than NDyV04. The diodes are almost obtainable...only 3 varieties to date have been found by me to produce a 100mW output {1.2 watter}. The hard part is the price to build Vs. complete units. The assembled units are looking up now that I have checked around on prices. My guy here said he has all crystals and prisms on hand. I could build them , but will outweigh comercially available units. No brainer. Maybe CNI units are the best for price I have seen so far. Importing ? :x Wanting to invite other investigations for a viable solution to a seemingly difficult problem.