I spoke to my local Mizuno dealer a few days ago. Nobody had asked to buy weights or shaft tips like I used to, since the last time I asked. They haven't gotten back to me about whether they can get them or not.
EDIT - Incredible... Just as I was writing this, Planet Golf called me. It has to be the Mizuno dealer who goes between me and the factory, but they said the only weights left are the 13 gram weights. I don't think you mentioned exactly what gram weights you are missing, so would 13 grams help?