Grammarly.com is a service that offers a perfect spell checking, proofreading, plagiarism checking and grammar checking which enables anyone to write error and legal-issue-free English articles for clients, blog posts and E-mails.

A must have any internet marketer, blog owners, writer, proofreaders etc.

In their official site

Yearly plan 139.95
and monthly $29.95

Will get from me a lifetime Grammarly Premium account only $30

paypal or bitcoin

Let me know if you have any question