Just contact Auntie Yangdu at the email address in her signature line.
I don't know if she has any left or not, I thought she was out long ago but one still pops up now and again.
We've seen them as low as 40 or 50 bucks, originally the 1st model was selling for 120 bucks and worth every penny and more.
If she doesn't have any, I suspect it will be quite a spell before we see any more, with things messed up over in Nepal and other projects to finish or start after a shop rebuild and such.
Only Auntie knows for sure. She knows everything.