Informational Website QA Testing

I have a set of content-driven, informational websites that must be verified from end to end before launch. What I need is a thorough quality-assurance pass that looks at functionality, usability, and performance on both desktop browsers and mobile devices... (Budget: $15 - $25 USD, Jobs: Accessibility Testing, Selenium, Software Testing, Testing / QA, Usability Testing, User Experience Research, Web Testing, Website Testing)