Finding / Building ssy-1 laser

Hey lpf, i am new here and have some questions about ssy-1 ND:yag lasers. For one what does ssy-1 stand for? also why are they hardly find able, are they old or just not manufactured anymore? or both? Also if you found a place to buy it then please do link below! Finally if i cant find one i will have to build my own. i looked at a quick image of whats inside it and its basically just a flash lamp, yag rod, reflective cap, lenses... BUT THERE ALL EXPENSIVE:(. please help me out here thank you much.