Proof-reading Web blogs

Description

We are looking for someone to proofread a series of website blogs each month.
Each blog is circa 1000 word - some slightly under / over and has been written by our SEO agency for our network of mortgage / finance websites.
The blogs need to be checked for good quality english and grammar and formatting etc.
Atm we have 8 blogs a month but likely to increase further.
Seeking a regular and reliable provider to work with long term.Please provide a quote per hour to proof read as per above and advise how much time to complete each blog.