Look for UnkamenSupplies on etsy.com.
The only thing that concerns me about that wire is this:
You will need to tumble your creations after you make them. I use mixed shape steel shot and burnishing solution and tumble them for several days.
This is apparently to get rid of the "matte finish" and to make the wire shiny. I wish there was a place that sold Ti wire without this so-called "matte finish." (What is this finish, anyway?)