Hi triandesigns,
The 9" and 12" circulars can be found at this website, which is in the US:
https://www.eknittingneedles.com/. And they have international shipping--$9 for shipping with orders of $15 minimum. They have 16" circulars as well.
I also found another video for knitting with 9" circulars. It has 8 videos, but for some reason video #6 has been removed. But she has a website through YouTube and her own. Here is the You Tube video link:
In case there's a problem with the link, the title is: How To Knit A Sock! Part 1 of 8 HD Quality Video. And her website is
http://springersyarnnook.com/
Just as a side note I am learning soooo much from you guys. It was coincidental (or maybe not

) about after seeing 9 and 12" circulars at the eknitting needles website that I inquired about what to make with them. I wish I had known about knitting socks with these circulars sooner!!