I'm waiting to seriously look in to a 3-D printer. I'd like to see it go through a few more generations, maybe have someone make one just for small items. I could also use a place to put it. Too bad several of us don't live closer to each other because we could go in on one together. Have you looked at the Wanted Action Figure site or her Ebay store for heads?
Making your own custom heads is only restricted by your skills. I've been working on and off for a few years and I'm not getting worse. There are home casting kits if you need it out of resin.
*If you've ever seen the episode of South Park with Wing singing she's for real http://youtu.be/u9ZdTnJ9X9Y