Mortal Kombat Mask?

Don't know where you are but my local Toys R Us had 1/6 scale Ninja army figures on sale for $9.

You could also use a soda can and cut it using scissors for tha mask it's cheap and very easy to get just experiment with different designs .
Here's an idea For a layered mask cut one mask shape out of the can and glue the screen over the (inside of the can- shiny side ) and cut another design to layer over the screen with like a square to show off the screen and glue or pin it to the head of the figure .

Probably the best cheap six-scale base body you can get for sixth scale figures are M&C Toy's Power Team Elite figures. They're only $10-11 at Big Lots (if they haven't raised the price this year, I haven't looked.) The joints can be a little loose on them, but they've got tons of articulation and a lot of variety in head sculpts. The accessories are pretty good too. The only bad thing is that they have lead in them...

Here's a review I did of the last one I bought, in September of last year, the Combat Engineer:

Check out -Ross , big lots ,price busters or even dollor tree to see if they have 12 inch G.I. Joe's I found a few a while back for cheap but I dident pick them up they were the ones that were released after the movie came out but those stores usually have older items in stock so there a hit & miss but you never know .
Also Tuesday morning ( it's a store weird name I know ) but when I lived in North Carolina I would come across very random and cool figures there for cheap like Marvel a legend Moon Knight for $7.00 or a 12 inch detective Chow ( chow yun fat ) figure mint in the box for $10.00 ( please note this was a few years ago so the items you may fond in those stores may vary ) but there good hunting grounds for good deals .

Yeah I was thinking about getting this Sideshow Cobra Ninja guy head online, but it was $36 just for the head itself. I'm going to poke around and try to find a cheaper one.

The bay has some headcasts for Firefly and Joe ninjas. You could use a bicyle innertube and cut it with an exacto for the mask and glue it on.

The metal mesh idea is awesome! I'm going to try that.

Giving it some more thought, an even better armature would be a piece of fine metal mesh or window screen, bent to conform to the figure's facial features. The clay should stick very well to the checkered texture and it will give you consistant internal support across the entire mask. Another option you could do on the cheap for an armature is to fold a piece of aluminum foil over two or three times and press that into the shape of the face and cut it down to size.

Cool, I wouldn't have even thought of that! I figured the clay would be too thin as you said. Thanks for the info, here's hoping I can make it without throwing it across the room!

If your sculpey is really thin, breakage might be an issue, but, as long as you're careful, it should be okay. Peeling it off the face, without deforming it, will probably be problematic though. You'll probably want a small metal armature inside of it (thin wire should do the trick), for support and so that it keeps its shape when it's removed. I'd also recommend wadding up a ball of aluminum foil, in the shape/size of the face, as a frame to bake it on, so that it doesn't sag/deform under its own weight while it's cooking.

I was thinking about if there was some sort of clay, like if I could mold the mask on the face with Sculpey, pop it off, and bake it. I wasn't sure if it would break.

If you aren't any good at sculpting, you could probably make a mask by bending up a piece of cardboard into the proper shape and cutting grill slits into it.