Hi I need a mobile app created for already existing site . - repost

I have got a current professional networking website for a client and need a mobile app create for the same . The website has got a problem tracker and allows user to do a search on problems etc after logging in .I want an app like facebook, but it will have a lot less features and would be compatible on mobile devices Kindly let me know the price's and examples of what you have [login to view URL] references would be better .A NDS would need to be signed and potential candidate if good .,will be hired for future projects too ..