I have a set on Modern Motorsports companion flanges I just pulled off my 280Z (I going to convert to Wolf Creek half shafts). New these sell for $400, I will sell these for $300 including shipping. That includes the 12 half shaft mounting bolts.
I also have two sets of 280zxt half shafts but both sets have torn boots. One set is disassembled and cleaned the other is just as they came off my car. I will sell them with new boots in boxes for $200 including shipping. Sorry I do not have the 27 spine stub axles, mine are 5 lug and I'm keeping them.