I don`t think a ``cheap`` helmet could be done for less than $700...from any Alien movie. GEEK 1138 has STL files of the first Alien helmet if you want to print it. He has an Etsy page.
not sure if you're still looking or not but i started printing and body shopping the GEEK 1138 helmet and am going down a different route and want to sell what i currently have complete.