TomTop offers the Zombie Rotface Monster Mask for $12.99. Coupon code "TTHALO1" drops it to $11.04. That's $29 off list and the lowest price we could find. It's constructed from latex.

Note: This item ships from China and may take two to six weeks to arrive. Also, the countdown timer on the product page does not reflect an actual expiration time and resets daily.