How much does it cost to rephrase content ?

I'm not native english but I write my own article. Just need to be sure it sounds native so would like to know how much it would cost me, sample here:

http://reboltutorial.com/blog/rebol-grand-unification-theory/

 

There is no set price. What you want is either editing or proofreading. You can search for people advertising those services in the services or content creation sections of this forum. You cannot start your own thread to advertise until you have been a member for 14 days and have 25 posts. Because these types of threads resemble ads and attract people posting offers, and because this is a discussion area of the forum (no ads allowed), I'm closing the thread.