cabochon

Made this cute little cabochon last night. It's small for most of the things I do, it's about 25mm. I'd like to find some lampwork oval cabochon mandrel that are 30 by 40 mm. That's one of the standard sizes, for settings and etcetera but I'm not seeing anything out there. Is anybody got any in 30 x 40, or willing to custom make them?