There's a Dutch 3D printing company that will ship worldwide. The price for Henning's model, printed in polyamide, polished and dyed black, is around $60 plus about $20 shipping:
Shapeways.com cost about the same but lower shipping ($10).
Thanks, Pete. In case the 3D approach appears too expensive for a 55-year-old scope (that still works with its tabletop tripod), I've purchased the Neweer device you linked earlier along with some gaffer tape.