Article Writer Needed for Automotive Niche

I need a dedicated writer to create articles for an automotive blog cum website for a client of mine. The key words will be specified and the keyword density will be specified too. Total article length will be up to 500 words with a few headings and sub heading. Total article count will be around 500 too and I am willing to pay around USD 3 for each article. Beware, this is not grub material or blurb. I want sensible article writers who can make sense. Plus if you don't have good grammar or spellings don't waster your time and mine.