Little Knits still has some Louisa Harding Angora left. It is not 100% angora (which would be really expensive), but it is beautiful yarn and they have many colors. Also search for Knitting Fever Angora Extra, they have a few colors of that left as well.
Now that I live in Seattle, I get to check out stuff in person. Quite a bit of the Louisa Harding angora has come home with me.