I purchased 7 (one of each color) Mothership Opal Spheres a couple weeks ago. They are Lab Grade 5mm Opal Spheres with a heat resistance of over 900° C.
When the order was placed, I still had a functioning Terp Slurper. Unfortunately, my Toro mini Terp Slurper broke before I could use them so they are still brand new.
I paid $105 for all 7, shipped. I am selling all 7 for only $90, shipped.