What is the cost of proofreading?

So what is the normal cost of proofreading?
It should be lower than hiring someone for a fresh new content right?

-nevermind I searched and found this on quora

So it's around $9/1000 words
and here are some sites to try.
papertrue.com: $0.026 per word
scribiendi.com : $0.041 per word
proofreadingpal.com: $0.044 per word
proofreadingservices.com: $0.039 per word
wordy.com : $0.0255-$0.03 per word, depending on your subscription plan
editmyenglish.com : $0.026 per word
kibin.com : $0.035 per word
writesaver.co: $0.005-$0.01 per word (cheapest I’ve found)

BTW do any sellers in bhw offer this kind of service?

Not only am I interested in Proofreading like yourself but would be interested in having a copy writer rewrite the content for conversion.

am charging 500 words for 5$ little bit high but proofreading by ezine authors