This is so easy task cuz it is very easy to convert any website into an app. You can also do this for free but if you want to make a professional app for your website then hire mobile app developer from here otherwise you can also hire a freelancer for this and I am pretty sure it will cost you around 110+$
it depends on your current website deisgn customizaton plan.....to view your website as quality and more responsive in mobile app....
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For the responsive mobile app, it will cost you a lot of money but if you just want to convert your site into an app then it will not be costly check out this texas-based mobile app development company for app development.