I dig those prop hairs from random Japanese sites that offer MQO models for Metasequoia. The meshes quality are not particularly good, and often require remodeling. Most come triangulated (to be used in MMD) and need to be remodeled into quads, which is quite a tricky thing when it comes to Anime hair. Many programs, like 3DSMAX, have options to quadrify meshes, but they tend to remove the wrong edges and destroy the model. I used to have a large collection of meticulously remodeled hair props in my runtime, but I had a hard drive crash back in 2013 and lost EVERYTHING - the entire Poser runtime. I have slowly started to build it back, but so far I only managed to gather a dozen pieces. I am making backups on an external drive now.
The promo with 4 Nearme figures, however, use hair from Nearme herself. Some ship with her, and some I have purchased directly from eFrontier in Japan.