It’s available on eBay. There’s a bunch of them.

The description of the mask is almost as bizarre as the mask itself: 

You are purchasing a very high end very life-like silicone rubber Elvis Presley mask with attached hair and side burns. It is a perfect replica of Elvis from his “Come Back TV Special” of 1968.

Made from ultra flexible human skin-like silicone rubber.

Sideburns and eyebrows bristle like real ones and have human-like realism having been put into the rubber one-at-a-time.

The hair is a wig and is made in the same way that people wigs are made. It is attached (sewn) onto the mask.

The combination of the mask and wig cover entire head.

MASK WILL REQUIRE TRIMMING TO MAKE IT FIT WELL.

IMPORTANT NOTE: This mask is HOT AND SCRATCHY, and generally UNCOMFORTABLE and should NOT be worn more than a few minutes at a time.

ITEM is NEW-REFURBISHED—Never worn. It was removed from a new Alive Elvis robot.

 
Here’s a video of the Elvis robot prior to having its face ripped off.
 

 
Thanks Anne Raso.