Rebadged Samyang 14mm is the only thing for under $300.
You are looking at a damaged copy of a 10-20mm at best for that price.
I sold mine (optically perfect, mount cracked, af slightly off) for $325. Then the cops borrowed it from the person I sold it to but they promised to give it back after we give them thousands in court fees and fines.
try
http://www.fredmir...com/forum/board/10